commit-msg hook: Add Change-Id after Depends-On: footer

Zuul uses Depends-On to test with dependencies.
So lets add it to the commit-msg.

Change-Id: Iae2bd55d2c4bd6463763b9bfe05837f47e9db598

gerrit-server/src/main/resources/com/google/gerrit/server/tools/root/hooks/commit-msg

diff --git a/gerrit-server/src/main/resources/com/google/gerrit/server/tools/root/hooks/commit-msg b/gerrit-server/src/main/resources/com/google/gerrit/server/tools/root/hooks/commit-msg
index aace2b3..cca2ac1 100644
--- a/gerrit-server/src/main/resources/com/google/gerrit/server/tools/root/hooks/commit-msg
+++ b/gerrit-server/src/main/resources/com/google/gerrit/server/tools/root/hooks/commit-msg
@@ -19,7 +19,7 @@
 
 unset GREP_OPTIONS
 
-CHANGE_ID_AFTER="Bug|Issue|Test"
+CHANGE_ID_AFTER="Bug|Depends-On|Issue|Test"
 MSG="$1"
 
 # Check for, and add if missing, a unique Change-Id