Setup a default KUBEVIRT_PROVIDER for make functional-test (#1675)

This requires removing set -u because kubevirtci's scripts
use [ -z $KUBEVIRTCI_PATH ] to test for it being defined
and set -u makes this fail.

Signed-off-by: Maya Rashish <mrashish@redhat.com>

hack/build/run-functional-tests.sh

@@ -14,14 +14,15 @@
 #See the License for the specific language governing permissions and
 #limitations under the License.
 
-set -euo pipefail
+set -eo pipefail
 
 readonly MAX_CDI_WAIT_RETRY=30
 readonly CDI_WAIT_TIME=10
 
 script_dir="$(cd "$(dirname "$0")" && pwd -P)"
 source hack/build/config.sh
 source hack/build/common.sh
+source cluster-up/hack/common.sh
 
 KUBEVIRTCI_CONFIG_PATH="$(
     cd "$(dirname "$BASH_SOURCE[0]")/../../"