Fix syntax

Author: DifferentialOrange

tarantool/connection_pool.py

@@ -206,7 +206,8 @@ def update_ro_info(self):
     def connect(self):
         for addr in self.addrs:
             key = json.dumps(addr)
-            self.pool[key]['conn'].connect()
+            if not self.pool[key]['conn'].connected:
+                self.pool[key]['conn'].connect()
 
         self.update_ro_info()