Fix node labeller bug: Remove proper labels & search for prefix
Fix node labeller bug: Remove proper labels & search for prefix

This commit fixes two node labeller bugs:
1. Remove host model CPU and required features from node properly
2. Remove labels by prefix instead of "Contains"

Signed-off-by: Itamar Holder <b6ebf050aad0538d1e30c557853a5c8924b66230@redhat.com>

kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt