[Debian] debrepack revision misses the "src_files"

[Yue Tao]

Debian Packaging should increment based on relevant git commits to its source. The SRC_GITREVCOUNT tracks the change of "src_path" folder, however it doesn't cover the "src_files".

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/starlingx/root/+/875584

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/root/+/875584
Committed: https://opendev.org/starlingx/root/commit/16a8d89c370fedc840e652e392d2ac56e1b1bd3b
Submitter: "Zuul (22348)"
Branch: master

commit 16a8d89c370fedc840e652e392d2ac56e1b1bd3b
Author: Yue Tao <email address hidden>
Date: Tue Feb 28 10:25:45 2023 +0800

    debrepack.py: "FILES_GITREVCOUNT" calculates "src_files" revision

    Introduce the "FILES_GITREVCOUNT" to calculate the "src_files"
    git commits and update package's revision.

    The most complex scenario is multi src_files are in different
    repositories, so request each file to set a base commit. If all
    files are in same directory, it only calculates once.

    For example:

    src_files:
      - AAA/BBB/CCC
      - DDD/EEE/FFF
      - GGG/HHH/III
    ...
    revision:
      FILES_GITREVCOUNT:
        - xxxxxxxxx
        - yyyyyyyyy
        - zzzzzzzzz

    Test Plan:

    Pass: build-pkgs -c -a
    Pass: Observe the change of "src_files" updates to revision
    Pass: build-image

    Closes-bug: 2008748

    Signed-off-by: Yue Tao <email address hidden>
    Change-Id: I56bb612c829b69d8946fa4516d06255abb2bdd0b