<broker> Updated spec file for correct user_action.log location

Spec was still referencing /var/log/openshift/user_action.log instead of
/var/log/openshift/broker/user_action.log this was causing the logfile
to be created with the wrong permissions when oo-accept-broker is run

user_action.log for the broker was moved from /var/log/openshift to /var/log/openshift/broker/ a while back, but there were still references to the original location.