$::osfamily instead of $::operatingsystem and $::operatingsystemmajrelease instead of $::operatingsystemrelease

This commit applies two changes :

  * $::osfamily instead of $::operatingystem : This way fork of common linux
    distributions will be handled without having the need to add them manually

  * $::osfamilymajrelease instead of $::operatingsytemreleade : Avoid the use
    of a regular expression