pam: support 14.04
pam: support 14.04

In 14.04 our pam_systemd module used a different format for the
login cgroups.  If we find one of those in our name, then we want
to just chown it to us and not do anything more, just as we do in
xenial.

Signed-off-by: Serge Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>

Xeno22/lxcfs,Xeno22/lxcfs