qa_crowbarsetup: Mount local repos dir via 9p

Mount $localreposdir_target if set via 9p inside the crowbar VM.
This can be used later to use local repositories. Useful to minimize
network traffic.
qa_crowbarsetup: add d3.cloud
qa_crowbarsetup: only use ipmi when explicitly enabled
qa_crowbarsetup: enable IPMI/BMC
nfs_mount the Cloud Updates repo in nue_nfs

Fixes #59
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
Merge pull request #60 from mapleoin/updates-repo

nfs_mount the Cloud Updates repo in the nue_nfs cases
mkcloud: use explicit ssh options
mkcloud: we dont need to modify .ssh/config

with options now being passed explicitly to ssh
Merge pull request #63 from bmwiedemann/master

ssh hostkey rework
mkcloud: update test host env