MT#8613 Add basic CRUD for LI X-1 provisioning
MT#8491 Fix subscriber termination via API.

1.Provisioning_voip_subscribers may be already deleted during termination.
2.Return issue already fixed in master, seems like not integrated in 3.3.
Revert "MT#8491 Fix subscriber termination via API."

This reverts commit 1b654d559a78402867310fad12d338f78237eb75.

Real fix was done already as fix for the MT#8071
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MT#8621 Check callforward spec against empty desctinations
MT#8633 Properly set is_primary on sub creation
MT#8449 Fix clearing unused alias numbers

Take billing.voip_numbers as reference for clearing unused dbalias
entries.
MT#8609 API: Don't add ringtimeout into empty callforwardTimeout.
MT#8649 Add callforwards link into subscribers info
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MT#8609 Add "ringtimeout" into CallForward Timeout "cft" description.
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