Try to create ssh configuration directory

[sajith]

Following up the discussion on #301: create_ssh_config() as well as __create_and_save_key() methods would simply fail if our ssh configuration directory (which we typically expect to be ~/work/fabric_config/, but it could be elsewhere as well) does not exist.

fabrictestbed-extensions/fabrictestbed_extensions/fablib/fablib.py

Lines 798 to 805 in 00a072c

	dir_path = os.path.dirname(bastion_ssh_config_file)
	if not os.path.exists(dir_path):
	msg = (
	f"Directory {dir_path} does not exist, can not create ssh_config file!"
	)
	print(msg)
	logging.error(msg)
	raise Exception(msg)

We could instead attempt to create the directory with os.mkdirs(dir_path) or pathlib.Path(dir_path).mkdir(parents=True).