cg: skip name= in cgroup named hierarchies

Skip the string "name=" when recreating cgroups directories in cgyard.
For example, systemd's entries in cgroup.img are:

	name: "name=systemd"
	path: "/user/1000.user/4.session"

When creating systemd subdir, named= should not be part of the name.

Signed-off-by: Saied Kazemi <saied@google.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>