Consist terminate_connection function signature

Clean up the "force=False" in function signature for terminate_connection
since it already accept **kwargs.

Thus make all function signature for terminate_connection consist to
    def terminate_connection(self, volume, connector, **kwargs)

Fixes: bug #1190419
Change-Id: I8765cb8f2aa3cfbb49ff57ae034b148aee35a8c4
Merge "Consist terminate_connection function signature"