Save the list of compute node

Fix #494

gns3server/controller/compute.py

@@ -87,6 +87,20 @@ class Compute:
         """
         return self._host
 
+    @property
+    def port(self):
+        """
+        :returns: Compute port (integer)
+        """
+        return self._port
+
+    @property
+    def protocol(self):
+        """
+        :returns: Compute protocol (string)
+        """
+        return self._protocol
+
     @property
     def user(self):
         return self._user