* Delete keypair by name if creation failed.

An laready existing keypair by that name is the most common reason for
the failure, so cleaning up just in case is a good idea.
Of course, there should not have been a left-over key ...

* Also look for left-over keypairs in regular cleanups.

* Better output for KEYPAIR creation.

* Use all AZs for wavestack (default).

* 1.92: Use az hints for VM networks.

This should allow neutron to optimize things a bit.
The VMs in a network are all in one AZ, so let neutron create that
network in the right AZ. Can be disabled by passing NAZS=" ".

Also call the one and only NET_JH and not NET_JH0.

Signed-off-by: Kurt Garloff <kurt@garloff.de>