Rework provision scripts for more testing

Rework provision scripts for more testing

This fixes up some issues with testdir (was not honoured) and
increases test coverage.

We now check all the major provision modes.  In doing so, to make it
possible to call from the multiple layers of 'sh', I have allowed 'dc'
to alias 'domain controller' and 'member' to alias 'member server'.
Fighting shell quoting in the test system was just too hard...

Also fix upgrade.py

Andrew Bartlett
(This used to be commit 0923de12282b0e063dd73bc3e056dd5c3663c190)