In some old nvme-cli versions the NVMe-oF create_hostnqn method fails.
This happens specifically on versions between not having the
show-hostnqn command and having it always return a value. On those
version the command only returns the value present in the file and never
tries to return an idempotent or random value.
This patch adds for that specific case, which is identified by the
stderr message:
hostnqn is not available -- use nvme gen-hostnqn
Closes-Bug: #2035606
Change-Id: Ic57d0fd85daf358e2b23326022fc471f034b0a2f
7da3d82773