Reverse proxy configuration should use outbound-socket-binding

The reverse proxy configuration in standalone.xml requires a string value and will not accept variables like most of the other options.

for example, something like this should be valid, but its currently not:

<handlers>
  <reverse-proxy name="reverse-proxy" connections-per-thread="30">
    <host name="${myURL}" instance-id="myRoute"/>
  </reverse-proxy>
<handlers>

Here you need to specify the name as something like "http://127.5.183.1:8080"