Update _setup.sh - Support for ClearOS

[marcnewton]

closes #631

ClearOS is a build of CentOS 7

rpm -q --whatprovides centos-release returns appropriate string to parse for version check.

[marcnewton]

On line 255 of this script there is a check for Supported distribution.

exec_cmd_nobail "curl -sLf -o /dev/null '${RELEASE_URL}'"
RC=$?

How to add clearos to the supported list, is this handled by rpm/test.sh?

Distribution is identified as "clearos-release-7-5.5.v7.x86_64".

[JesusPaz]

This issue is resolved with our new repository. More information can be found here.