Dynamic creation of vhost managed objects

The vhost management object done for beta1 requires a bean entry in the tomcat jboss-beans.xml. These should be created dynamically by the war deployer.

JBossWeb vhost metrics (in addition to availability)
<metric property="jboss.web:type=Host,host=%name%:aliases"
displayName="Aliases"
defaultOn="true" dataType="trait" />