Don't explode if get_status fails

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Remove unnecessary filter in do_update_keys()

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Avoid running chef automatically.

teuthology --lock formerly automatically ran chef on startup of
virtual machines. This covered up a bug where ceph-deploy would
not install properly. These changes remove the automatic running
of chef, and fixed some related issues when setting up keys on
virtual machines.

Fixes: 9318
Signed-off-by: Warren Usui <warren.usui@inktank.com>