set all awesomeos content enabled=0 by default

The default repo urls based on default cdn
will always be wrong, so dont enable them
by default.

Remove "always-enabled-content" entirely, since
that doesn't make sense now.

Prevent 404/401 trying to access made up paths
from the default cdn.
Merge pull request #321 from candlepin/alikins/test_content_disable

set all awesomeos content enabled=0 by default