scripts: check cc stable mailing list in commit
scripts: check cc stable mailing list in commit

Add a check for commits fixing a released bug.
Such commits are found thanks to scripts/git-log-fixes.sh.
They must be sent CC: stable@dpdk.org.
In order to avoid forgetting CC, this mail header can be written
in the git commit message.

Signed-off-by: Thomas Monjalon <ee2fa8b2681c737f775687e475dcbf2028a412f1@6wind.com>
Tested-by: Ferruh Yigit <ba8734c3c506d2e3557bd4ac8fdaccd25bdb9aa7@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk