feat: add test P2P methods

conference.js

         return this._room
             && this._room.getConnectionState();
     },
+    /**
+     * Obtains current P2P ICE connection state.
+     * @return {string|null} ICE connection state or <tt>null</tt> if there's no
+     * P2P connection
+     */
+    getP2PConnectionState () {
+        return this._room
+            && this._room.getP2PConnectionState();
+    },
+    /**
+     * Starts P2P (for tests only)
+     * @private
+     */
+    _startP2P () {
+        try {
+            this._room && this._room.startP2PSession();
+        } catch (error) {
+            logger.error("Start P2P failed", error);
+            throw error;
+        }
+    },
+    /**
+     * Stops P2P (for tests only)
+     * @private
+     */
+    _stopP2P () {
+        try {
+            this._room && this._room.stopP2PSession();
+        } catch (error) {
+            logger.error("Stop P2P failed", error);
+            throw error;
+        }
+    },
     /**
      * Checks whether or not our connection is currently in interrupted and
      * reconnect attempts are in progress.

config.js

     // disables or enables RTX (RFC 4588) (defaults to false).
     disableRtx: false,
     // Sets the preferred resolution (height) for local video. Defaults to 360.
-    resolution: 720
+    resolution: 720,
+    // Enables peer to peer mode. When enabled system will try to establish
+    // direct connection given that there are exactly 2 participants in
+    // the room. If that succeeds the conference will stop sending data through
+    // the JVB and use the peer to peer connection instead. When 3rd participant
+    // joins the conference will be moved back to the JVB connection.
+    //enableP2P: true
+    // How long we're going to wait, before going back to P2P after
+    // the 3rd participant has left the conference (to filter out page reload)
+    //backToP2PDelay: 5
 };