(packaging) Remove Ubuntu Oneiric from build targets

Oneiric is EOL, and we are no longer building for it. This commit removes the
Oneiric target from the build list for facter.

Signed-off-by: Moses Mendoza <moses@puppetlabs.com>
Merge pull request #461 from MosesMendoza/maint/stable/remove_oneiric

(packaging) Remove Ubuntu Oneiric from build targets