Renamed default handlers to noop

They're not the defaults, and all they do is log.
It makes more sense to call them noop anyway.

Fixed a bug in conductor/handlers/test_default uncovered
when deployer.default was removed.

Changed the configured default for worker to 'shell'
instead of 'noop'.

Change-Id: I761374ed840b1766e79816d0e0803347a3016ea2
Merge "Renamed default handlers to noop"