test: fix TEST-84-STORAGETM with nvme-cli < 2.7

The -vv parameter was added in version 2.7, check before using it

Follow-up for ebc0514

Author: bluca

test/units/TEST-84-STORAGETM.sh

@@ -11,6 +11,11 @@ if systemd-analyze compare-versions "$(nvme --version | grep libnvme | awk '{pri
     fi
 fi
 
+VERBOSE=""
+if systemd-analyze compare-versions "$(nvme --version | grep '^nvme' | awk '{print $3}')" ge 2.7; then
+    VERBOSE="-vv"
+fi
+
 /usr/lib/systemd/systemd-storagetm --list-devices
 
 modprobe -v nvmet-tcp
@@ -24,7 +29,7 @@ NVME_UUID="$(cat /proc/sys/kernel/random/uuid)"
 systemd-run -u teststoragetm.service -p Type=notify -p "Environment=SYSTEMD_NVME_UUID=${NVME_UUID:?}" /usr/lib/systemd/systemd-storagetm /var/tmp/storagetm.test --nqn=quux
 NVME_DEVICE="/dev/disk/by-id/nvme-uuid.${NVME_UUID:?}"
 
-nvme connect-all -vv -t tcp -a 127.0.0.1 -s 16858 --hostnqn="$(nvme gen-hostnqn)"
+nvme connect-all "${VERBOSE}" -t tcp -a 127.0.0.1 -s 16858 --hostnqn="$(nvme gen-hostnqn)"
 udevadm wait --settle --timeout=30 "$NVME_DEVICE"
 
 dd if="$NVME_DEVICE" bs=1024 | cmp /var/tmp/storagetm.test -