deploy: vdsm: software: drop powerkvm
deploy: vdsm: software: drop powerkvm

Dropping powerkvm support, not supported since 3.6

Change-Id: I58c1802846d97cee7b1f2c3272b1829f2c6b63dd
Signed-off-by: Sandro Bonazzola <fcb014d63786651910af5db2ecc5316c668188ef@redhat.com>

oVirt/ovirt-host-deploy,oVirt/ovirt-host-deploy,oVirt/ovirt-host-deploy