Fix possible connect recursion

Author: DifferentialOrange

Diff for: tarantool/mesh_connection.py

@@ -299,7 +299,7 @@ def connect(self):
             conn = self.pool[key]
 
             if not conn.connected:
-                conn.connect()
+                super(MeshConnection, conn).connect()
             if not conn.connected:
                 warn("can't connect to instance to get rw/ro state", ClusterDiscoveryWarning)
                 continue