cgroup, cpuset: don't use ss->pre_attach()
->pre_attach() is supposed to be called before migration, which is observed during process migration but task migration does it the other way around. The only ->pre_attach() user is cpuset which can do the same operaitons in ->can_attach(). Collapse cpuset_pre_attach() into cpuset_can_attach(). -v2: Patch contamination from later patch removed. Spotted by Paul Menage. Signed-off-by: NTejun Heo <tj@kernel.org> Reviewed-by: NFrederic Weisbecker <fweisbec@gmail.com> Acked-by: NPaul Menage <paul@paulmenage.org> Cc: Li Zefan <lizf@cn.fujitsu.com>
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