ceph: making changes to fix CI test failures

Changed the random port creation's max value from 255 to 254, as the IP
with value 255 fails.
Re-raise/propagate the 'ExecutionFailureException' exception so that we
don't end-up in ZERO exit value.

Signed-off-by: Arun Kumar Mohan <amohan@redhat.com>

.github/workflows/canary-integration-test.yml

@@ -83,6 +83,7 @@ jobs:
 
     - name: test external script create-external-cluster-resources.py
       run: |
+        kubectl -n rook-ceph exec $(kubectl get pod -l app=rook-ceph-tools -n rook-ceph -o jsonpath='{.items[0].metadata.name}') -- /bin/bash -c "echo \"$(kubectl get pods -o wide -n rook-ceph -l app=rook-ceph-mgr --no-headers=true|head -n1|awk '{print $6"\t"$1}')\" >>/etc/hosts"
         kubectl -n rook-ceph exec $(kubectl get pod -l app=rook-ceph-tools -n rook-ceph -o jsonpath='{.items[0].metadata.name}') -- mkdir -p /etc/ceph/test-data
         kubectl -n rook-ceph cp cluster/examples/kubernetes/ceph/test-data/ceph-status-out $(kubectl get pod -l app=rook-ceph-tools -n rook-ceph -o jsonpath='{.items[0].metadata.name}'):/etc/ceph/test-data/
         kubectl -n rook-ceph cp cluster/examples/kubernetes/ceph/create-external-cluster-resources.py $(kubectl get pod -l app=rook-ceph-tools -n rook-ceph -o jsonpath='{.items[0].metadata.name}'):/etc/ceph