dm-3.13-fixes

A set of device-mapper fixes for 3.13.

A fix for possible memory corruption during DM table load, fix a
possible leak of snapshot space in case of a crash, fix a possible
deadlock due to a shared workqueue in the delay target, fix to
initialize read-only module parameters that are used to export metrics
for dm stats and dm bufio.

Quite a few stable fixes were identified for both the thin-provisioning
and caching targets as a result of increased regression testing using
the device-mapper-test-suite (dmts).  The most notable of these are the
reference counting fixes for the space map btree that is used by the
dm-array interface -- without these the dm-cache metadata will leak,
resulting in dm-cache devices running out of metadata blocks.  Also,
some important fixes related to the thin-provisioning target's
transition to read-only mode on error.
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