[WFCORE-447] Add jboss-metadata-common 8.1.2.Final
[WFCORE-447] Add jboss-metadata-common 8.1.2.Final

This component is used by subsystem-tests/framework to resolve expressions in the
subsystem's XML prior to validate it against a XSD schema.

JIRA: https://issues.jboss.org/browse/WFCORE-447

JiriOndrusek/wildfly-core,yersan/wildfly-core,jamezp/wildfly-core,aloubyansky/wildfly-core,jamezp/wildfly-core,soul2zimate/wildfly-core,jfdenise/wildfly-core,luck3y/wildfly-core,yersan/wildfly-core,jfdenise/wildfly-core,bstansberry/wildfly-core,aloubyansky/wildfly-core,darranl/wildfly-core,ivassile/wildfly-core,soul2zimate/wildfly-core,bstansberry/wildfly-core,jamezp/wildfly-core,ivassile/wildfly-core,JiriOndrusek/wildfly-core,darranl/wildfly-core,bstansberry/wildfly-core,darranl/wildfly-core,JiriOndrusek/wildfly-core,aloubyansky/wildfly-core,yersan/wildfly-core,jfdenise/wildfly-core,luck3y/wildfly-core,ivassile/wildfly-core,soul2zimate/wildfly-core,luck3y/wildfly-core