Documented the currently bogus state of support for CFS user groups with
user namespaces.  In particular, all users in a user namespace should be
children of the user which created the user namespace.  This is yet to
be implemented.
Signed-off-by: NSerge E. Hallyn <serue@us.ibm.com>
Acked-by: NDhaval Giani <dhaval@linux.vnet.ibm.com>
Signed-off-by: NSerge E. Hallyn <serue@us.ibm.com>
Signed-off-by: NJames Morris <jmorris@namei.org>