hack/e2e-test: Add "hive-" prefix to cluster name

The uuidgen approach is from fce3741 (hack/e2e-test: Use uuidgen to
create the cluster name, 2019-02-19, openshift#222), where we were working
around a broken oc call and the installer's poor handling of long
cluster names.  The long-name handling has since been fixed, so this
commit drops the workaround 'cut'.  It also adds a 'hive-' prefix to
make it easier to track down issues when we leak CI resources.

Author: wking

hack/e2e-test.sh

@@ -53,7 +53,7 @@ CLUSTER_DEPLOYMENT_FILE="/tmp/cluster-deployment.json"
 # Create a new cluster deployment
 # TODO: Determine which domain to use to create Hive clusters
 export BASE_DOMAIN="hive-ci.openshift.com"
-export CLUSTER_NAME="$(uuidgen | cut -b-18)"
+export CLUSTER_NAME="hive-$(uuidgen)"
 export SSH_PUB_KEY="$(cat ${CLOUD_CREDS_DIR}/ssh-publickey)"
 export PULL_SECRET="$(cat ${CLOUD_CREDS_DIR}/pull-secret)"
 export AWS_ACCESS_KEY_ID="$(cat ${CLOUD_CREDS_DIR}/.awscred | awk '/aws_access_key_id/ { print $3; exit; }')"