qa_crowbarsetup: add d3.cloud
qa_crowbarsetup: only use ipmi when explicitly enabled
qa_crowbarsetup: enable IPMI/BMC
mkcloud: remove unused 'tempest' target

`./mkcloud tempest` isn't being used and it's completely broken, to run
tempest the way to go is `./mkcloud testsetup`.
mkcloud: Disable host key check during admin setup
qa_crowbarsetup: Add local repos support

When $localreposdir_target is set, local repositories are used for crowbar
managed nodes and to setup the crowbar node itself.