Remove "path" and "relative-to" attributes from CLI from transactions subsystem

As "process-id/file" functionality is not yet added in EAP, the "path" and "relative-to" attributes are useless in transactions subsystem of CLI.
Please remove them.
Also please remove them from "jboss-as-txn***.xsd" file as well.

For detailed discussion please refer to https://bugzilla.redhat.com/show_bug.cgi?id=1039081