FIX #284 Fixing double output when no password provided

[maxdevyatov]

Fix #284

After it hits ConnectAuthError with password is None it calls connect second time from the beginning with updated arguments.
There is no need to do the rest of the initial call, but it needs to return the result. So return added.

def connect(self, hostname, username, password, output_file,
                config_data=None, action=None, post_snap=None, **kwargs):
...
...
except ConnectAuthError as ex:
                if password is None and action is None:
                    password = getpass.getpass(
                        "\nEnter Password for username <%s> : " %
                        username)
                    self.connect(
                        hostname,
                        username,
                        password,
                        output_file,
                        config_data,
                        action,
                        post_snap,
                        **kwargs)
....