util: Add update_release_branch.py

This commit adds a script that can be used to update release branches
via a merge strategy from the main branch.  It leverages the existing
`update_release_branch.sh` script, but was rewritten in python and
made generic such that it could work with any branch.

It also allows baseboards to be specified along with a separate text
file that can contain other paths of interest.

The default merge strategy is the 'recursive' strategy with the
'theirs' strategy option.  The user may provide a different merge
strategy using the '-s' and '-X' options.

The script can be invoked in the following manner:

$ util/update_release_branch.py --baseboard dedede   \
--relevant_paths_file util/dedede-relevant-paths.txt \
firmware-dedede-13606.B-master

The syntax for the relevant_paths_file is simple.  Each path should be
own its own line and use the glob syntax that `git log` would expect.
Comments may be used with the `#` symbol.

BUG=None
BRANCH=None
TEST=util/update_release_branch.py --baseboard dedede   \
--relevant_paths_file util/dedede-relevant-paths.txt \
firmware-dedede-13606.B-master; Verify that merge commit is made and
commit message is as expected.

Signed-off-by: Aseda Aboagye <aaboagye@google.com>
Change-Id: Iedd650104bbe6fd231805cf79aedfdca0bd16dd3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2666675
Tested-by: Aseda Aboagye <aaboagye@chromium.org>
Reviewed-by: Tom Hughes <tomhughes@chromium.org>
Commit-Queue: Aseda Aboagye <aaboagye@chromium.org>
Auto-Submit: Aseda Aboagye <aaboagye@chromium.org>

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