Port utility function and classes from wallcve

Wallcve scan stables repos for candidates security commits not present in CentOS/RHEL repos.

Wallcve is moving to kernel-webhooks. This MR adds some utility functions implemented in the wallcve that might be useful for other projects.

For details on what is being added, check the individual commits.

38b04ccc (Wander Lairson Costa) cki_lib: add the built module

d9d141ea (Wander Lairson Costa) cki_lib/gitlab: Implement the get_mr_commits function

78731903 (Wander Lairson Costa) cki_lib/git: add the get_commit_files function

0bbc1d86 (Wander Lairson Costa) cki_lib: add git commit utility functions

30a168e2 (Wander Lairson Costa) misc: provide the run_command() function

cki_lib/built.py | 283 +++++++++++++++++++++++++++++++++++++++++++++++++++

cki_lib/git.py | 130 +++++++++++++++++++++++

cki_lib/gitlab.py | 27 +++++

cki_lib/misc.py | 27 +++++

setup.cfg | 1 +

tests/test_built.py | 176 ++++++++++++++++++++++++++++++++

tests/test_git.py | 253 +++++++++++++++++++++++++++++++++++++++++++++

tests/test_gitlab.py | 76 ++++++++++++++

tests/test_misc.py | 26 +++++

9 files changed, 999 insertions(+)