Move AFP dbpath from share to service setting

Ticket:	#4997
(cherry picked from commit 39f579d0046a3cce47fbd15e9c9c043602f08db7)

Conflicts:
	gui/sharing/models.py
Catch up latest changes in AFP sharing/services

Ticket:	#4997
(cherry picked from commit 30385297a65b27f22a15265dfbc54d4c46ccc8f6)
Data migration needs to be within dry_run block

(cherry picked from commit 616d1fc29ef91a03518475eef945ff2a73d9037a)