Move ocf_request from utils

ocf_request has always been first class citizen in OCF,
so lets place it along with another essential objects.

Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>

src/eviction/lru.c

@@ -11,7 +11,7 @@
 #include "../concurrency/ocf_concurrency.h"
 #include "../mngt/ocf_mngt_common.h"
 #include "../engine/engine_zero.h"
-#include "../utils/utils_req.h"
+#include "../ocf_request.h"
 
 #define OCF_EVICTION_MAX_SCAN 1024