mkcloud: update test host env
mkcloud: Pass cinder volume config to crowbar node

qa_crowbarsetup needs cinder_conf_volume_type and
cinder_conf_volume_params to configure the cinder volume backend
correctly.
qa_crowbarsetup: remove `defaultsuseusers.pl`

According to `defaultsuseusers.pl` is doing nothing 20121008
jenkins: add cinder backend params for os-mkcloud

2 extra parameters (cinder_conf_volume_type and
cinder_conf_volume_params) added to configure the cinder backend for
mkcloud.
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.