[Devel] c/r: Add UTS support

[Dan Smith]

This is the latest version of my UTS patch set.  It has been re-modified to
do restart in the kernel after much ponderage of the required algorithm
to do nested restart in userspace.  Thus, it no longer requires the
modified mktree.c from earlier sets.

The namespace information has been moved to follow the per-task
information in the checkpoint stream, per Oren's recommendation.

Checkpoint and restart of nested UTS namespaces is now supported.  In
support of that, the cr_may_checkpoint_task() function is updated to be
flexible about which namespaces must patch that of the root task.

The updated stub implementation of IPC namespace patch is included at
the end again.


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