Upgrade jboss-threads to 2.1.1.Final

WFLY: https://issues.jboss.org/browse/WFLY-1987 

EAP6.2 needs upgrade jboss-threads to 2.1.1.Final (https://bugzilla.redhat.com/show_bug.cgi?id=994281) which contains fix of https://bugzilla.redhat.com/show_bug.cgi?id=985204 
upgrade in upstream.