Support legacy slaves when invoking wildcard reads in a domain

This is a follow-on to WFCORE-282.

The WFCORE-282 solution will not work for requests with address patterns

/host=*/server=*

or

/host=somename/server=*

if the host named 'somename' is running a WFCORE version prior to 1.0.0.CR1 (or whatever release first has WFCORE-282 introduced.)

In particular, it won't work with slaves running EAP 6.x.

The problem is with either of those address patterns the DC will send a request addressed to

/host=somename/server=*

to the slave, and the slave will not be able to handle it, as it won't have the WFCORE-282 logic that lets it identify the relevant servers and send requests on to them.

Potentially this could be fixed by having the DC detect these patterns and not call

/host=somename/server=*

, instead adding a step to read the server child names from /host=somename and then call /host=somename/server=a, /host=somename/server=b, etc.