JSON service registry: parsing regex service url patterns makes assumptions about the syntax

[mmoayyed]

Try not to rely on the service url pattern to begin with ^, execute the following steps instead:

1. Parse the pattern. If valid regex, create the corresponding service.
2. Parse the pattern, if valid ANT, create the corresponding service.
3. Ignore the service, warn in the logs.

[mmoayyed]

Addressed via https://github.com/Unicon/cas-addons/pull/24