tests: Add p2ps_provision() method

tests: Add p2ps_provision() method

Add generic provision method. This method receives a seeker and an
advertiser devices, advertisement id, method, and a flag which indicates
whether deferred flow is expected. The method returns P2PS-PROV-DONE
events and the pin (if keypad or display method is used).

This method is needed to simplify the P2PS provision flows in the tests.
This method complies to the P2PS specification regarding the expected
order of the show and display PIN events.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Reviewed-by: Max Stepanov <Max.Stepanov@intel.com>
Reviewed-by: Ilan Peer <ilan.peer@intel.com>