move gate hooks to gate/

We prevent a lot of tests from getting run on tools/ changes given
that most of that is unrelated to running any tests. By having the
gate hooks in that directory it made for somewhat odd separation of
what is test sensitive and what is not.

This moves things to the gate/ top level directory, and puts a symlink
in place to handle project-config compatibility until that can be
updated.

Change-Id: Iec9e89f0380256c1ae8df2d19c547d67bbdebd65

gate/README

@@ -0,0 +1,4 @@
+These are hooks to be used by the OpenStack infra test system. These scripts
+may be called by certain jobs at important times to do extra testing, setup,
+etc. They are really only relevant within the scope of the OpenStack infra
+system and are not expected to be useful to anyone else.

gate/post_test_hook.sh

@@ -0,0 +1,21 @@
+#!/bin/bash -x
+
+MANAGE="/usr/local/bin/nova-manage"
+
+function archive_deleted_rows {
+    # NOTE(danms): Run this a few times to make sure that we end
+    # up with nothing more to archive
+    for i in `seq 30`; do
+        $MANAGE db archive_deleted_rows --verbose --max_rows 1000
+        RET=$?
+        if [[ $RET -gt 1 ]]; then
+            echo Archiving failed with result $RET
+            return $RET
+        elif [[ $RET -eq 0 ]]; then
+            echo Archiving Complete
+            break;
+        fi
+    done
+}
+
+archive_deleted_rows