Revert "ims_usrloc_pcscf: Improvement: Let the consumer decide, if we want to retrieve REGISTERED only or all contacts (especially, if we have more than one contact per IP/Port)"
	- this is already done in changes coming in...
	- rely on the consumer to check the status of the contact if one is found

This reverts commit fe8a06a2e1b18219e52b3a85abd3f3961cc9773a.
modules/ims_usrloc_pcscf: hash now on IP only and some contact search changes
	- hash on IP required, considering with IPSEC/TLS there could be multiple contacts per IP... - these all need to resolve to the same contact
	- the contact searches updated accordingly and simplified using uri parser
	- new contact search returns a contact regardless of state the contact is in... up to consumer to test the state the are/are not interested in