Use python logging isntead of print

* jeepyb/cmd/manage_projects.py: Record errors with python logging
instead of printing to stdout. Additionally add some logging in places
where it was lacking (where exceptions may potentially be thrown) and
where we return error.

Change-Id: I9e0712e3c0d363230058de7222248b802e333dd4
Merge "Use python logging isntead of print"