Cleaning up standard out

Tracebacks don't belong in standard out, this commit
o puts all logging message in the log file
o changes the default log level to info
o prints a summary of the error to stdout in red if there was a failure

Conflicts:
	packstack/plugins/cinder_250.py

Change-Id: Idf8a19cda21b920e295fe24a2e5c0b7a1528aea0
Merge "Cleaning up standard out"