Note that the included stackrc shouldn't be.

Cloud credentials are not machine specific, and global API state - so
by our principled separation of concerns they should be configured and
managed by API scripts rather than in-instance orchestation. Doing
that is a long term change, but documenting it can happen now.

Change-Id: I96c35cd26e2db10d12216b499ba72907366f5342
Increase PXE deploy timeout.

Several users with slightly older hardware report the PXE deploy
process aborting deploys that were progressing fine. By increasing the
default PXE deploy timeout we should cater for this. A separate bug
has been filed in Nova/Ironic about the timeout being too simple.

Change-Id: I8ca0525ce57edb9256a35db54e955e1832279f64