Move common user and freelist partition data to a new struct

New structure ocf_part is added to contain all the data common for both
user partitions and freelist partition: part_runtime and part_id.
ocf_user_part now contains ocf_part structure as well as pointer to
cleaning partition runtime metadata (moved out from part_runtime) and
user partition config (no change here).

Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>

src/engine/engine_pt.c

@@ -9,7 +9,7 @@
 #include "cache_engine.h"
 #include "../ocf_request.h"
 #include "../utils/utils_io.h"
-#include "../utils/utils_part.h"
+#include "../utils/utils_user_part.h"
 #include "../metadata/metadata.h"
 #include "../concurrency/ocf_concurrency.h"
 
@@ -75,7 +75,7 @@ int ocf_read_pt_do(struct ocf_request *req)
 		/* Probably some cache lines are assigned into wrong
 		 * partition. Need to move it to new one
 		 */
-		ocf_part_move(req);
+		ocf_user_part_move(req);
 
 		ocf_hb_req_prot_unlock_wr(req);
 	}