Fix trove guest confing to ignore user os_admin

This value of ignore_users in the guest config needs to be set
correctly to ignore the local os_admin user for the trove functional
tests to pass in a devstack-gate environment.

Change-Id: Ia31dfe8f2eab4b24790b6be0dbc474cf50f39afa
diff --git a/lib/trove b/lib/trove
index 2552745..a4a455e 100644
--- a/lib/trove
+++ b/lib/trove
@@ -180,6 +180,7 @@
     iniset $TROVE_CONF_DIR/trove-guestagent.conf DEFAULT nova_proxy_admin_pass $RADMIN_USER_PASS
     iniset $TROVE_CONF_DIR/trove-guestagent.conf DEFAULT trove_auth_url $TROVE_AUTH_ENDPOINT
     iniset $TROVE_CONF_DIR/trove-guestagent.conf DEFAULT control_exchange trove
+    iniset $TROVE_CONF_DIR/trove-guestagent.conf DEFAULT ignore_users os_admin
     iniset $TROVE_CONF_DIR/trove-guestagent.conf DEFAULT log_dir /tmp/
     iniset $TROVE_CONF_DIR/trove-guestagent.conf DEFAULT log_file trove-guestagent.log
     setup_trove_logging $TROVE_CONF_DIR/trove-guestagent.conf