Make dummy auth delays configurable

[NelsonVides]

This makes the delays configurable, which by default are too long and that's something that can be noticed in CI.

[codecov]

Codecov Report

Merging #3131 (c239f44) into master (5166ab3) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3131      +/-   ##
==========================================
+ Coverage   79.46%   79.47%   +0.01%     
==========================================
  Files         395      395              
  Lines       32168    32172       +4     
==========================================
+ Hits        25563    25570       +7     
+ Misses       6605     6602       -3     

Impacted Files	Coverage Δ
src/auth/ejabberd_auth_dummy.erl	68.18% <100.00%> (+5.02%)	⬆️
src/config/mongoose_config_spec.erl	98.48% <100.00%> (+<0.01%)	⬆️
src/pubsub/node_hometree.erl	77.77% <0.00%> (-5.56%)	⬇️
src/wpool/mongoose_wpool.erl	84.00% <0.00%> (-1.00%)	⬇️
src/global_distrib/mod_global_distrib_utils.erl	65.09% <0.00%> (-0.95%)	⬇️
src/ejabberd_sm.erl	84.17% <0.00%> (-0.34%)	⬇️
src/mam/mod_mam_utils.erl	89.56% <0.00%> (-0.34%)	⬇️
src/mod_muc_room.erl	77.45% <0.00%> (-0.06%)	⬇️
src/mod_muc_log.erl	77.72% <0.00%> (ø)
src/ejabberd_c2s.erl	89.35% <0.00%> (+0.07%)	⬆️
... and 5 more

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[DenysGonchar]

how about to test it? e.g. we can set this configuration options for "test type" host_type.

[NelsonVides]

Pushed so :)

[NelsonVides]

Here, now carboncopy for dynamic domains is pretty fast: https://circleci-mim-results.s3.eu-central-1.amazonaws.com/PR/3131/55777/pgsql_mnesia.23.0.3-1/big/ct_run.test@default-44683ef9-9b3c-4852-b093-e90d801f50e2.2021-05-27_09.27.12/big_tests.tests.carboncopy_SUITE.logs/run.2021-05-27_09.27.14/suite.log.html 😄

[DenysGonchar]

Nice. I like this change.