Merge branch 'issue-2094'

This patch stack was designed to accomplish the following:

* Cleanly address the pool incompatibility which was accidentally
  introduced post-0.6.2 but pre-0.6.3.  This required adding
  infrastructure which can be used from now on to notify system
  administrators of errata which affect their pool.

* Add additional automated regression testing to ensure this type
  of compatibility issue is caught prior to the change being merged.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2094