[WFLY-3081] : Forward port of BZ-900786

Adding new attributes using socket bindings for redirect port and proxy configuration of web connector.
Failing if the attributes are defined in previous xsd configuration file.
Adding tests for WildFly legacy upgrade, these tests are failing because of WFLY-3153.

Replaces https://github.com/wildfly/wildfly/pull/6011 since it is considered an EAP6 driven feature.

Jira : https://issues.jboss.org/browse/WFLY-3081
EAP PR : jbossas/jboss-eap#1028
BZ : https://bugzilla.redhat.com/show_bug.cgi?id=900786 (since it is a forward port fr the web legacy subsystem)