(19873) Add OS major release fact
Cloning ticket 15714 and submitting new PR with recommended changes to try to get this taken care of.

On RHEL clones and Debian
(Amazon,CentOS,CloudLinux,Debian,Fedora,OEL,OracleLinux,OVS,RedHat,Scientific,SLC)
it would be useful to pull out the major release version

ie 5.8=>5, 6.3=>6, 6.0.3=>6 (this is especially useful when creating URLs for package downloads)

This is available as the lsbmajdistrelease but there are too many dependencies on LSB for minimal installs
Merge branch 'master' of github.com:wolfspyre/facter

Conflicts:
	lib/facter/operatingsystemmajrelease.rb