run.py: Add target name to logging info

Signed-off-by: Sam Lang <sam.lang@inktank.com>
nuke.py:  Allow name of job/run to be specified

Nuke will cleanup the base test directory by default, but can
cleanup the test directory for a given run if specified.

Signed-off-by: Sam Lang <sam.lang@inktank.com>
task/ceph_manager.py:  Conditional power cycle

Fix the monitor case where no config is initialized, so
we don't need to check for the powercycle parameter.

Signed-off-by: Sam Lang <sam.lang@inktank.com>