[0/4] patchtest: refactor and simplify, part 1

This series is the preliminary step in what is intended to be a larger
refactor of the patchtest codebase. It consists mainly of the removal of
a custom _exec() function and underlying supports in favor of the
GitPython module's built-in capabilities and .execute() method for
interacting with a git repo. This functionality is critical for
patchtest to match patches to correct branches and setup temporary ones
for testing; the changes here allow it to rely on a purpose-built set of
utilities in GitPython while reducing the amount of patchtest-specific
code to maintain. There are also a couple of other minor changes to
remove unused/minimally-used code and to modify one test case to test
against a different file for stability (README-OE-Core.md instead of
README).

Selftest results:

XFAIL: TestMbox.test_bugzilla_entry_format (file: TestMbox.test_bugzilla_entry_format.fail)
XPASS: TestMetadata.test_summary_presence (file: TestMetadata.test_summary_presence.pass)
XFAIL: TestMbox.test_mbox_format (file: TestMbox.test_mbox_format.1.fail)
XFAIL: TestMetadata.test_src_uri_left_files (file: TestMetadata.test_src_uri_left_files.fail)
XSKIP: TestMbox.test_series_merge_on_head (file: TestMbox.test_series_merge_on_head.2.skip)
XPASS: TestMbox.test_commit_message_presence (file: TestMbox.test_commit_message_presence.pass)
XFAIL: TestMbox.test_commit_message_presence (file: TestMbox.test_commit_message_presence.fail)
XPASS: TestMbox.test_signed_off_by_presence (file: TestMbox.test_signed_off_by_presence.pass)
XFAIL: TestMetadata.test_cve_check_ignore (file: TestMetadata.test_cve_check_ignore.fail)
XFAIL: TestPatch.test_cve_tag_format (file: TestPatch.test_cve_tag_format.fail)
XFAIL: TestMbox.test_author_valid (file: TestMbox.test_author_valid.1.fail)
XFAIL: TestMbox.test_shortlog_length (file: TestMbox.test_shortlog_length.fail)
XPASS: TestMbox.test_mbox_format (file: TestMbox.test_mbox_format.pass)
XFAIL: TestPatch.test_signed_off_by_presence (file: TestPatch.test_signed_off_by_presence.fail)
XFAIL: TestMbox.test_shortlog_format (file: TestMbox.test_shortlog_format.fail)
XFAIL: TestMbox.test_mbox_format (file: TestMbox.test_mbox_format.2.fail)
XPASS: TestPatch.test_cve_tag_format (file: TestPatch.test_cve_tag_format.pass)
XSKIP: TestMbox.test_series_merge_on_head (file: TestMbox.test_series_merge_on_head.1.skip)
XPASS: TestMbox.test_author_valid (file: TestMbox.test_author_valid.2.pass)
XPASS: TestMetadata.test_lic_files_chksum_modified_not_mentioned (file: TestMetadata.test_lic_files_chksum_modified_not_mentioned.pass)
XPASS: TestMbox.test_bugzilla_entry_format (file: TestMbox.test_bugzilla_entry_format.pass)
XPASS: TestMetadata.test_src_uri_left_files (file: TestMetadata.test_src_uri_left_files.pass)
XPASS: TestMetadata.test_lic_files_chksum_presence (file: TestMetadata.test_lic_files_chksum_presence.pass)
XFAIL: TestMbox.test_signed_off_by_presence (file: TestMbox.test_signed_off_by_presence.2.fail)
XFAIL: TestMbox.test_author_valid (file: TestMbox.test_author_valid.2.fail)
XFAIL: TestMetadata.test_lic_files_chksum_presence (file: TestMetadata.test_lic_files_chksum_presence.fail)
XPASS: TestMbox.test_shortlog_format (file: TestMbox.test_shortlog_format.pass)
XPASS: TestMbox.test_author_valid (file: TestMbox.test_author_valid.1.pass)
XPASS: TestPatch.test_signed_off_by_presence (file: TestPatch.test_signed_off_by_presence.pass)
XFAIL: TestMetadata.test_lic_files_chksum_modified_not_mentioned (file: TestMetadata.test_lic_files_chksum_modified_not_mentioned.fail)
XPASS: TestMbox.test_shortlog_length (file: TestMbox.test_shortlog_length.pass)
XPASS: TestMetadata.test_cve_check_ignore (file: TestMetadata.test_cve_check_ignore.pass)
XFAIL: TestMbox.test_signed_off_by_presence (file: TestMbox.test_signed_off_by_presence.1.fail)
XFAIL: TestMetadata.test_summary_presence (file: TestMetadata.test_summary_presence.fail)
============================================================================
Testsuite summary for patchtest
============================================================================
# TOTAL: 34
# XPASS: 15
# XFAIL: 17
# XSKIP: 2
# PASS: 0
# FAIL: 0
# SKIP: 0
# ERROR: 0
============================================================================

Trevor Gamblin (4):
  patchtest: requirements.txt: add GitPython
  patchtest: repo: refactor to use GitPython
  patchtest: tests: update bugzilla_entry_format.fail testfile
  patchtest: utils: remove unused functions

 meta/lib/patchtest/repo.py                    |  88 +++---------
 meta/lib/patchtest/requirements.txt           |   1 +
 .../TestMbox.test_bugzilla_entry_format.fail  |  25 ++--
 meta/lib/patchtest/utils.py                   | 129 ++----------------
 4 files changed, 42 insertions(+), 201 deletions(-)