cgcreate: use "*" character as a meta character for all mounted controllers

cgcreate: use "*" character as a meta character for all mounted controllers

This patch adds the possibility to use meta character "*" as a shortcut for all mounted controllers. This meta character can be used in "-g" option.

For example:
    $ cgcreate -g *:first  -g cpu:second
    $ lssubsys
    cpuset:/
    cpuset:/first
    cpu,cpuacct:/
    cpu,cpuacct:/first
    cpu,cpuacct:/second
    memory:/
    memory:/first
    devices:/
    devices:/first
    freezer:/
    freezer:/first
    net_cls,net_prio:/
    net_cls,net_prio:/first
    blkio:/
    blkio:/first
    perf_event:/
    perf_event:/first
    hugetlb:/
    hugetlb:/first

Signed-off-by: Ivana Hutarova Varekova <varekova@redhat.com>
Reviewed-by: Jan Chaloupka <jchaloup@redhat.com>