libcgroups adds -tools subpackage

[Jan Safranek]

Starting with libcgroup-0.37.1-3 (heading to rawhide right now),
libcgroup is divided into following subpackages:
- libcgroup - the library only
- libcgroup-tools - command line tools, services and daemons, previously
part of libcgroup.rpm

Please check your RPM dependencies and update them accordingly. AFAIK
there are only two packages dependent on libcgroup:

libvirt
policycoreutils

Jan