Mitigate GSSAPIAuthError

[vfreex]

koji.GSSAPIAuthError: unable to obtain a session still occurs very frequently
after applying 0436b54.

This PR proposes a workaround by calling gssapi_login on runtime.shared_koji_client_session
before we build any image or rpm. This would significantly reduce the number of gssapi_login calls
in one doozer invocation. Even if gssapi_login fails in the first call, it fails earlier.

[openshift-bot]

Build #1

GLOB sdist-make: /mnt/workspace/jenkins/working/art-tools_doozer_PR-487/setup.py
py3 create: /mnt/workspace/jenkins/working/art-tools_doozer_PR-487/.tox/py3
py3 installdeps: -rrequirements-dev.txt
py3 inst: /mnt/workspace/jenkins/working/art-tools_doozer_PR-487/.tox/.tmp/package/1/rh-doozer-1.3.15.zip
py3 installed: aiofiles==0.7.0,astroid==2.6.5,attrs==21.2.0,autopep8==1.5.7,backports.entry-points-selectable==1.1.0,bashlex==0.15,cached-property==1.5.2,certifi==2021.5.30,cffi==1.14.6,charset-normalizer==2.0.3,click==8.0.1,contextvars==2.4,coverage==5.5,cryptography==3.4.7,decorator==5.0.9,Deprecated==1.2.12,distlib==0.3.2,dockerfile-parse==1.2.0,filelock==3.0.12,flake8==3.9.2,flexmock==0.10.5,future==0.18.2,gssapi==1.6.14,idna==3.2,immutables==0.15,importlib-metadata==4.6.1,importlib-resources==5.2.1,iniconfig==1.1.1,isort==5.9.3,kobo==0.19.0,koji==1.25.1,lazy-object-proxy==1.6.0,mccabe==0.6.1,mock==4.0.3,mysql-connector-python==8.0.26,packaging==21.0,platformdirs==2.1.0,pluggy==0.13.1,protobuf==3.17.3,py==1.10.0,pycodestyle==2.7.0,pycparser==2.20,pyflakes==2.3.1,pygit2==1.6.1,PyGithub==1.55,PyJWT==2.1.0,pykerberos==1.2.1,pylint==2.9.6,PyNaCl==1.4.0,pyparsing==2.4.7,pytest==6.2.4,python-dateutil==2.8.2,PyYAML==5.4.1,requests==2.26.0,requests-gssapi==1.2.3,requests-kerberos==0.12.0,rh-doozer @ file:///mnt/workspace/jenkins/working/art-tools_doozer_PR-487/.tox/.tmp/package/1/rh-doozer-1.3.15.zip,rpm==4.14.3,rpm-py-installer==1.1.0,semver==2.13.0,six==1.16.0,tenacity==8.0.1,toml==0.10.2,tox==3.24.0,typed-ast==1.4.3,typing==3.7.4.3,typing-extensions==3.10.0.0,urllib3==1.26.6,virtualenv==20.6.0,wrapt==1.12.1,zipp==3.5.0
py3 run-test-pre: PYTHONHASHSEED='2386853806'
py3 run-test: commands[0] | flake8
py3 run-test: commands[1] | coverage run --branch --source doozerlib -m unittest discover -t . -s tests/
..............................Environment variables required for db operation missing. Doozer will be runningin no DB use mode.
.Environment variables required for db operation missing. Doozer will be runningin no DB use mode.
.Environment variables required for db operation missing. Doozer will be runningin no DB use mode.
.Environment variables required for db operation missing. Doozer will be runningin no DB use mode.
.........................................s.s....................................s.s...s.s.s..s.s.s................................................................................................ERROR:doozer.tests.test_runtime:Error attempting to find target branch branch hash: whatever
...................
----------------------------------------------------------------------
Ran 236 tests in 1.317s

OK (skipped=10)
py3 run-test: commands[2] | coverage report
Name                                    Stmts   Miss Branch BrPart  Cover
-------------------------------------------------------------------------
doozerlib/__init__.py                      11      4      2      1    62%
doozerlib/assembly.py                     103     18     60      6    80%
doozerlib/assertion.py                     22      0      6      0   100%
doozerlib/brew.py                         329    193    146      3    39%
doozerlib/build_status_detector.py         76      4     46      2    93%
doozerlib/cli/__init__.py                 100     45     20      0    46%
doozerlib/cli/__main__.py                1161   1161    480      0     0%
doozerlib/cli/cli_opts.py                  16      3      6      0    86%
doozerlib/cli/config_plashet.py           533    533    248      0     0%
doozerlib/cli/detect_embargo.py           163     35     70      8    75%
doozerlib/cli/images_health.py             79     28     24      2    61%
doozerlib/cli/images_streams.py           556    556    232      0     0%
doozerlib/cli/release_gen_assembly.py     156    156     76      0     0%
doozerlib/cli/release_gen_payload.py      340    258    163      1    19%
doozerlib/cli/rpms_build.py               165     59     58      8    57%
doozerlib/cli/scan_sources.py             153    123     78      2    16%
doozerlib/config.py                        98     98     44      0     0%
doozerlib/constants.py                      9      0      0      0   100%
doozerlib/coverity.py                     238    209     74      0     9%
doozerlib/dblib.py                        248    152     68      4    35%
doozerlib/distgit.py                     1368    906    634     13    31%
doozerlib/dotconfig.py                     56     44     32      0    14%
doozerlib/exceptions.py                     3      0      0      0   100%
doozerlib/exectools.py                    194     75     76     17    56%
doozerlib/gitdata.py                      168    133     76      0    14%
doozerlib/image.py                        263    220    132      2    11%
doozerlib/logutil.py                       10      1      2      1    83%
doozerlib/metadata.py                     424    170    190     26    55%
doozerlib/model.py                        111     21     36      2    82%
doozerlib/olm/__init__.py                   0      0      0      0   100%
doozerlib/olm/bundle.py                   218    163     36      0    22%
doozerlib/operator_metadata.py            364     65     66      6    79%
doozerlib/plashet.py                      134      9     90     15    89%
doozerlib/pushd.py                         21      2      2      0    91%
doozerlib/repos.py                        207    105    113     17    44%
doozerlib/rhcos.py                         36      9      6      0    74%
doozerlib/rpm_builder.py                  226     31    121     32    81%
doozerlib/rpmcfg.py                       145     56     58      8    57%
doozerlib/runtime.py                      845    613    346      9    22%
doozerlib/source_modifications.py          89     28     18      3    65%
doozerlib/state.py                         24     12      8      0    38%
doozerlib/util.py                         313    134    110      5    54%
-------------------------------------------------------------------------
TOTAL                                    9775   6432   4053    193    31%
___________________________________ summary ____________________________________
  py3: commands succeeded
  congratulations :)