Avoid redundant clone and reshape (#1376)

* Avoid redundant clone and reshape

* Removed some constructors

* Fixed output precision

inference-engine/include/cpp/ie_cnn_network.h

@@ -51,9 +51,11 @@ public:
 
     /**
      * @brief A constructor from ngraph::Function object
+     * This constructor wraps existing ngraph::Function
+     * If you want to avoid modification of original Function, please create a copy
      * @param network Pointer to the ngraph::Function object
      */
-    explicit CNNNetwork(const std::shared_ptr<const ngraph::Function>& network);
+    explicit CNNNetwork(const std::shared_ptr<ngraph::Function>& network);
 
     /**
      * @brief A destructor