Watch for the reset state in the provisioner, and whack boot_device if we hit it.

This should fix a case where a node is reset to change the RAID config, but
we do not forget what device we shoudl boot from like we should.
Merge pull request #91 from VictorLowther/pull-req-release-fred-master-f1e4ea797ca7b956a0c90301bd38ef8eed4e242e

Merged by devtool for aabes