Add --force-quattor flag to override /etc/noquattor

Allow operator to override the noquattor flag via command line (for one
time controlled updates).

Also downgrade messages emitted when encountering noquattor flag to
warnings since this is an expected, and not erroneous, condition.

Replaced mixed tabs/spaces in the region of the code being modified.
Merge pull request #3 from ned21/force-quattor

Add --force-quattor flag to override /etc/noquattor