Prepare aacess layer for integration with distrib layer.

The commit allow to use ssa db functionality from
ibssa repository. It includes following:
* Use default values for PK and SL
* Change structure of includes: ssa_path_record.h is
  moved to include/infiniband folder.
* Configuration key with-ssa key is changed to
  with-ibssa
* ssa_prdb.c is moved to ibssa repository