Use cline concurrency ctx instead of cache

Cacheline concurrency functions have their interface changed
so that the cacheline concurrency private context is
explicitly on the parameter list, rather than being taken
from cache->device->concurrency.cache_line.

Cache pointer is no longer provided as a parameter to these
functions. Cacheline concurrency context now has a pointer
to cache structure (for logging purposes only).

The purpose of this change is to facilitate unit testing.

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

src/engine/engine_wt.c

@@ -34,7 +34,8 @@ static void _ocf_write_wt_req_complete(struct ocf_request *req)
 		ocf_engine_invalidate(req);
 	} else {
 		/* Unlock reqest from WRITE access */
-		ocf_req_unlock_wr(req);
+		ocf_req_unlock_wr(req->cache->device->concurrency.cache_line,
+				req);
 
 		/* Complete request */
 		req->complete(req, req->info.core_error ? req->error : 0);