Add warrning when test script is started by normal user
Add warrning when test script is started by normal user

The runlibcgrouptest.sh will now whine when script is started by non-root
user. Root permissions are needed to create directories and mount the cgroups
there.

Signed-off-by: Jan Safranek <a7f4b96ffdd515ecef00f117294da18555749b0b@redhat.com>

jrfastab/Linux-cgdcbxd,rafalmiel/libcg,rafalmiel/libcg,jrfastab/Linux-cgdcbxd,jrfastab/Linux-cgdcbxd,rafalmiel/libcg,rafalmiel/libcg,jrfastab/Linux-cgdcbxd