Support for FD.io commit message requirements

[vvalderrv]

FD.io Gerrit submissions require specific commit message fields and formatting that are documented in the VPP commit template.

Reference
[https://github.com/FDio/vpp/blob/master/.git_commit_template.txt](https://github.com/FDio/vpp/blob/master/.git_commit_template.txt)

Here are some recent VPP commits for reference
https://gerrit.fd.io/r/c/vpp/+/41088
https://gerrit.fd.io/r/c/vpp/+/45011
https://gerrit.fd.io/r/c/vpp/+/44865

It appears CSIT doesn't have the same requirements
CSIT
https://gerrit.fd.io/r/c/csit/+/45059
https://gerrit.fd.io/r/c/csit/+/44142
https://gerrit.fd.io/r/c/csit/+/45030