Revert "[1828] Cleanup code by using with"

This reverts commit 9040c49022e84e7b1398e84a14abd54f8d99ec8c.

src/bin/xfrout/xfrout.py.in

@@ -804,13 +804,15 @@ class UnixSockServer(socketserver_mixin.NoPollMixIn,
         '''Check whether the socket file 'sock_file' exists and
         is being used by one running xfrout process. If it is,
         return True, or else return False. '''
-        with socket.socket(socket.AF_UNIX) as sock:
-            try:
-                sock.connect(sock_file)
-            except socket.error as err:
-                return False
-            else:
-                return True
+        try:
+            sock = socket.socket(socket.AF_UNIX)
+            sock.connect(sock_file)
+        except socket.error as err:
+            sock.close()
+            return False
+        else:
+            sock.close()
+            return True
 
     def shutdown(self):
         self._write_sock.send(b"shutdown") #terminate the xfrout session thread