git-am -s add systematically an empty line before adding the
signoff line, which interfere with gerrit's rule that
the ChangeID must be in the last paragraph
This patch address that be remoming an existing Change-Id from
the commit message and re-insterting it at the 'proper' place
Change-Id: I I742b17031c6e3da4f9d94dcb0579bce8c496d41d
Signed-off-by: Norbert Thiebaud <nthiebaud@gmail.com>
This a a prep-work for if and when we use gerrit
it is very important to call gerrit's commit-msg hook
and the sooner we teach our own hook to play nice with it
the less likely we will have issue during migration
