Fix stuck autoreconnect case

When we call ping() at a not connected socket the following call trace
is proceeded: ping() -> _send_request() -> _opt_reconnect() -> {here
self.socket is None} -> connect() -> {inconnect is set to True} ->
connect_basic() -> connect_tcp() -> raise NetworkError -> fall though
try-except in connect() -> use null self._socket when try to send a
packet.

A test case ('test_01_simple') will be added within the following
commit.

Author: Totktonada

tarantool/connection.py

@@ -210,7 +210,7 @@ def connect(self):
             self._socket.settimeout(self.socket_timeout)
             self.load_schema()
             self.inconnect = False
-        except socket.error as e:
+        except Exception as e:
             self.connected = False
             self.inconnect = False
             raise NetworkError(e)