Add a testcase for client.save_host_keys.
No need for 'self.tc' within a single test :)
Small refactor
Saner (to me) positive assertion
Check correct stored hosts filename.
ditto
Changelog, fixes #176
Merge branch '1.10' into 1.11

Conflicts:
	NEWS
Merge branch '1.11' into 1.12

Conflicts:
	NEWS
Merge branch '1.12'