python-bareos: use socket.create_connection()

- remove hard-coded AF_INET in socket creation.
- replace socket.connect() by a higher-level function
  socket.create_connection() allowing AF_INET6 familly connection.
- set a default of 30 to self.timeout, simplify code to remove
  `if self.timeout ...`

Signed-off-by: Bruno Friedmann <bruno.friedmann@bareos.com>

python-bareos/bareos/bsock/lowlevel.py

@@ -92,7 +92,7 @@ def __init__(self):
         self.logger.debug("init")
         self.status = None
         self.address = None
-        self.timeout = None
+        self.timeout = 30
         self.password = None
         self.pam_username = None
         self.pam_password = None
@@ -236,12 +236,9 @@ def __connect(self):
         return auth
 
     def __connect_plain(self):
-        self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
         # initialize
         try:
-            if self.timeout:
-                self.socket.settimeout(self.timeout)
-            self.socket.connect((self.address, self.port))
+            self.socket=socket.create_connection((self.address, self.port),self.timeout)
         except (socket.error, socket.gaierror) as e:
             self._handleSocketError(e)
             raise bareos.exceptions.ConnectionError(