ipatests: collect IPA_RENEWAL_LOCK file
    
    In order to troubleshoot certmonger timeouts, collect the
    file /run/ipa/renewal.lock that is used as cross-process lock
    by ipa-server-guard.
    
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>