fattr: always prefix attributes with a known namespace
fattr: always prefix attributes with a known namespace

This translates "bugzilla.url" to "user.bugzilla.url" correctly.
Can be overridden by a "." prefix.

grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks