Some simple helper patches to enable implementation of multiple PTY
(or device) namespaces.

	[PATCH 1/4]: Propagate error code from devpts_pty_new
	[PATCH 2/4]: Factor out PTY index allocation
	[PATCH 3/4]: Move devpts globals into init_pts_ns
	[PATCH 3/4]: Enable multiple mounts of /dev/pts

This patchset is based on earlier versions developed by Serge Hallyn
and Matt Helsley.
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