Enhanced cgsnapshot to print named hierarchies.

Enhanced cgsnapshot to print named hierarchies.

cgsnapshot should show named hierarchies in 'mount' section. It already shows
their groups in 'group' sections and the output should be consistent.
And take care of quotes in the output, '=' is not valid character in controller
name unless it is in double quotes.

Example:
$ mount -t cgroup -o none,name=hello none /cgroup/named
$ mount -t cgroup -o cpuacct,name=cputest none /cgroup/cpuacct
$ cgsnapshot

mount {
	cpuacct = /cgroup/cpuacct;
	"name=hello" = /cgroup/named;
	"name=cputest" = /cgroup/cpuacct;
}

Signed-off-by: Jan Safranek <jsafrane@redhat.com>
Acked-by: Ivana Hutarova Varekova<varekova@redhat.com>