Allow policy for sources and targets to handle multiple wildcards

As per the upstream policy documentation in the secion on AMQP Source and Target Wildcard and Name Substitution utilization of the asterisk wildcard is constrained as per the following quote:

The asterisk is recognized only if it is the last character in the link name.

It is desirable that the configuration could handle a situation where there are multiple asterisks in use such as:

"tstGroup": {
    "users": "tst@amq",
    "sources": "abc.*,my.*.b2b.tst.*",
    "targets": "abc.*,my.*.b2b.tst.*",
    "remoteHosts": "*"
}