Merge pull request #15063 from dkurt:dnn_ie_ocv_layers

* Wrap unsupported by IE layers as custom layers

* Replace pointers to layers blobs to their shapes

* Enable Faster R-CNN with IE backend on CPU

modules/dnn/test/test_halide_layers.cpp

@@ -554,6 +554,11 @@ TEST_P(ReLU, Accuracy)
     Backend backendId = get<0>(get<1>(GetParam()));
     Target targetId = get<1>(get<1>(GetParam()));
 
+#if defined(INF_ENGINE_RELEASE) && INF_ENGINE_VER_MAJOR_EQ(2019020000)
+    if (backendId == DNN_BACKEND_INFERENCE_ENGINE && targetId == DNN_TARGET_MYRIAD && negativeSlope < 0)
+        applyTestTag(CV_TEST_TAG_DNN_SKIP_IE, CV_TEST_TAG_DNN_SKIP_IE_2019R2);
+#endif
+
     LayerParams lp;
     lp.set("negative_slope", negativeSlope);
     lp.type = "ReLU";