qa_crowbarsetup: Support cinder volume type select

Add 2 more variables to support cinder volume type selection.
$cinder_conf_volume_type indicates the type (e.g. local or netapp) and
$cinder_conf_volume_params can contain some configuration
parameters. E.g. to configure netapp, the variable could look like this:

storage_family 'ontap_7mode'
storage_protocol 'iscsi'
nfs_shares ''
vserver ''
netapp_server_hostname '192.168.124.11'
netapp_server_port 443
netapp_login 'admin'
netapp_password ''
netapp_vfiler ''
netapp_transport_type 'https'
netapp_volume_list ''
mkcloud: Also undefine virsh net and nodes

Networks and nodes are no longer transient so both must be undefined.
qa_crowbarsetup: Mount local repos dir via 9p

If requested via $localreposdir_src, mount $localreposdir_target via 9p
inside the crowbar VM. This can be used later to use local repositories.
Useful to minimize network traffic.
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.