Target information retrievers for WS services default URL '/arex' path
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This merge request is automatically copied from !426 (merged) orginally made by @andrii
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ARC client plugins implements the 'default URL guessing' approach in case the only hostname are passed to the '-c' or similar options.
However the current code provides 'https://hostname' URL that is ambiguous and cannot be used without '/arex' in the URL path. This results in MCC Plexer: UNKNOWN_SERVICE_ERROR
in the A-REX log and anyway don't allow infoquery with this plugin.
This MR modifies the 'guessing' functions to produce 'https://hostname/arex' URL that will work in case of default 443 port setup.
This allows for example to use: arcinfo -I org.ogf.glue.emies.resourceinfo arc.hostname
and even without -I will be used as successful LDAP GLUE2 fallback in case LDAP is unavailable.