ceph/teuthology — pull request #214 by wusui (2014-03-01 03:29:47+00:00)
Title: Lines formerly of the form '(remote,) = ctx.cluster.only(role).remotes.k...

...eys()'

and '(remote,) = ctx.cluster.only(role).remotes.iterkeys()' would fail with
ValueError and no message if there were less than 0 or more than 1 key.
Now a new function, get_single_remote_value() is called which prints out
more understandable messages.

Fixes: 7510
Signed-off-by: Warren Usui