Fix: Set connection timeout for the ssh remote host key socket too

This allows to adjust the timeout for all ssh connections. Before the
long default timeout was used for this socket connection.

gvm/connections.py

@@ -299,6 +299,7 @@ def _get_remote_host_key(self):
         """Get the remote host key for ssh connection"""
         try:
             tmp_socket = socketlib.socket()
+            tmp_socket.settimeout(self._timeout)
             tmp_socket.connect((self.hostname, self.port))
         except OSError as e:
             raise GvmError(