kubernetes job owner name

[jeffrey856]

Added env var TOIL_KUBERNETES_OWNER to help identify different users kube jobs.

[adamnovak]

This is pretty much exactly what I want.

We're relying on the user not to give us a too-long/uppercase/otherwise prohibited TOIL_KUBERNETES_OWNER, but I think that's fine.

I'm going to slightly tweak the documentation, though.

[adamnovak]

The Python 2 integration tests are failing with this:

_____ AWSJobStoreTest.test_testImportSharedFile__otherCls_filejobstoretest _____
Traceback (most recent call last):
  File "/builds/databiosphere/toil/src/toil/test/jobStores/jobStoreTest.py", line 124, in setUp
    self.jobstore_initialized.initialize(self.config)
  File "/builds/databiosphere/toil/src/toil/jobStores/aws/jobStore.py", line 148, in initialize
    super(AWSJobStore, self).initialize(config)
  File "/builds/databiosphere/toil/src/toil/jobStores/abstractJobStore.py", line 146, in initialize
    self.writeConfig()
  File "/builds/databiosphere/toil/src/toil/jobStores/abstractJobStore.py", line 154, in writeConfig
    pickle.dump(self.__config, fileHandle, pickle.HIGHEST_PROTOCOL)
  File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
    self.gen.next()
  File "/builds/databiosphere/toil/src/toil/jobStores/aws/jobStore.py", line 552, in writeSharedFileStream
    yield writable
  File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
    self.gen.next()
  File "/builds/databiosphere/toil/src/toil/jobStores/aws/jobStore.py", line 1122, in uploadStream
    assert bool(self.version) == (self.content is None)
AssertionError

This is the same problem as observed in #2869; I think there's a problem with that test now. Maybe Amazon changed something? I'll open an issue.