(packaging) Use the packaging loader for tasks

The packaging repo now uses an explicit loader which handles loading the
various rake tasks in packaging. This commit updates the hiera Rakefile to use
the loader instead of a blind glob of the ext/packaging/tasks directory.  We
move this load into the rescue LoadError block because the packaging repo won't
always be there.

Signed-off-by: Moses Mendoza <moses@puppetlabs.com>
(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 hiera.

Signed-off-by: Moses Mendoza <moses@puppetlabs.com>
Remove unused patchsys-quilt.mk from rules

We don't use this in hiera, and it's causing unusual errors in our latest and
greatest jenkins setup. This commit removes it.

Signed-off-by: Moses Mendoza <moses@puppetlabs.com>