Create /var/log/kolla/rally before running rally-manage db create/upgrade

Change-Id: I6f88a4ecb4ba980836b4778252bb49731463f4eb
Closes-bug: #1630377

docker/rally/extend_start.sh

 #!/bin/bash
 
-# Bootstrap and exit if KOLLA_BOOTSTRAP variable is set. This catches all cases
-# of the KOLLA_BOOTSTRAP variable being set, including empty.
-if [[ "${!KOLLA_BOOTSTRAP[@]}" ]]; then
-    rally-manage db create || rally-manage db upgrade
-    exit 0
-fi
-
 if [[ ! -d "/var/log/kolla/rally" ]]; then
     mkdir -p /var/log/kolla/rally
 fi
 if [[ $(stat -c %a /var/log/kolla/rally) != "755" ]]; then
     chmod 755 /var/log/kolla/rally
 fi
+
+# Bootstrap and exit if KOLLA_BOOTSTRAP variable is set. This catches all cases
+# of the KOLLA_BOOTSTRAP variable being set, including empty.
+if [[ "${!KOLLA_BOOTSTRAP[@]}" ]]; then
+    rally-manage db create || rally-manage db upgrade
+    exit 0
+fi