utils: hooks: pre-push: Reject commits with a Change-Id

We're not using gerrit, so let's prevent Change-Id tags creeping in
unadvertently.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

utils/hooks/pre-push

@@ -63,6 +63,13 @@ do
 			echo >&2 "No Reviewed-by or Acked-by in commit $commit"
 			errors=$((errors+1))
 		fi
+
+		# 4. The commit message shall not contain a Change-Id.
+		if echo "$msg" | grep -q '^Change-Id:'
+		then
+			echo >&2 "Found Change-Id in commit $commit"
+			errors=$((errors+1))
+		fi
 	done
 
 	if [ $errors != 0 ]