Reload keystone to apply osprofiler config

In DevStack Keystone is configured and started within the same phase
(while other services allow to be configured before starting). To apply
osprofiler configuration, Keystone needs to be reloaded.

Change-Id: Icf69c4e7f602702cf68986a6073b2cd4c0c3abe8

devstack/lib/osprofiler

@@ -94,6 +94,9 @@ function configure_osprofiler() {
             iniset $conf profiler connection_string $OSPROFILER_CONNECTION_STRING
         fi
     done
+
+    # Keystone is already running, should be reloaded to apply osprofiler config
+    reload_service devstack@keystone
 }