CI: Add branch cutting awk scripts

The CR 97b4dbd2fcc9e7018 replaced the branch cutting awk
script with python.

However, the awk scripts written are more stable for branch
cutting but were removed without python script being
tested properly.

The python script fails preserve the comment lines
and does not work when anchors are used in the projects.

Signed-off-by: Anil Belur <abelur@linuxfoundation.org>
Change-Id: I5318a7cc93f75d21552916935632ce4a4ea0a0cf