[packaging] Remove natty from the deb pkg list, its EOL

Ubuntu Natty is EOL, and we are no longer going to build or ship for this
distribution. This commit removes it from the default list of distributions we
build for in facter.

Signed-off-by: Moses Mendoza <moses@puppetlabs.com>
Merge pull request #398 from MosesMendoza/maint/1.6.x/remove_natty_from_cow_list

[packaging] Remove natty from the deb pkg list, its EOL
Merge branch '1.6.x' into 1.7.x

* 1.6.x:
  [packaging] Remove natty from the deb pkg list, its EOL
(#17083) Add rhev & ovirt support to the virtual fact

Without this patch the virtual fact does not return specific values for
the RHEV hypervisor or oVirt nodes.  This path addresses the problem by
implementing specific checks for these virtualization platforms.
Merge branch 'jaredcurtis-ticket/1.7.x/17083_virtual_support_for_RHEL_oVirt' into 1.7.x

* jaredcurtis-ticket/1.7.x/17083_virtual_support_for_RHEL_oVirt:
  (#17083) Add rhev & ovirt support to the virtual fact

closes #397
Merge branch '1.7.x' of https://github.com/puppetlabs/facter into 1.7.x