Added packages/infra_libs as the first Python package.

packages/infra_libs/infra_libs/.coveragerc

 # This file exist despite having .coveragerc in infra_libs because on Windows
 # bots, we only execute tests in certain modules of infra_libs (including this
-# one) and the latest version of pragma throws an exception when given a
+# one) and the latest version of coverage throws an exception when given a
 # non-existant config file.
 
 [run]
-include = ./infra_libs/event_mon/*
+include = ./packages/infra_libs/infra_libs/*
 
 [report]
 exclude_lines =
     # Have to re-enable the standard pragma
     pragma: no cover
 
     # Don't complain about missing debug-only code:
     def __repr__
     if self\.debug
 
     # Don't complain if tests don't hit defensive assertion code:
     raise AssertionError
     raise NotImplementedError
 
     # Don't complain if non-runnable code isn't run:
     if 0:
     if __name__ == ['"]__main__['"]:
 
 [expect_tests]
 expected_coverage_min = 100