Update is_wrlinux to check /etc/os-release
Update is_wrlinux to check /etc/os-release

Instead of checking the presence of /etc/wrlinux-release, we open
/etc/os-release and check for the CPE_NAME entry.

Signed-off-by: T.O. Radzy Radzykewycz <42643c4b7097caf134d24250ba84a20c9d927877@windriver.com>

OpenSCAP/openscap,mpreisler/openscap,redhatrises/openscap,mpreisler/openscap,redhatrises/openscap,OpenSCAP/openscap,redhatrises/openscap,jan-cerny/openscap,mpreisler/openscap,OpenSCAP/openscap,Hexadorsimal/openscap,OpenSCAP/openscap,Hexadorsimal/openscap,Hexadorsimal/openscap,jan-cerny/openscap,redhatrises/openscap,redhatrises/openscap,mpreisler/openscap,jan-cerny/openscap,Hexadorsimal/openscap,OpenSCAP/openscap,jan-cerny/openscap,mpreisler/openscap,redhatrises/openscap,Hexadorsimal/openscap,jan-cerny/openscap,Hexadorsimal/openscap,mpreisler/openscap,jan-cerny/openscap,OpenSCAP/openscap