Fix fernet-node-sync error catching

Backport: train stein rocky
Depends-On: https://review.opendev.org/701779
Related-Bug: #1859047
Change-Id: I09844e0807a93d9edd8d014276b0174d77a993a0

ansible/roles/keystone/templates/fernet-node-sync.sh.j2

 #!/bin/bash
 
+set -o errexit
+set -o pipefail
+
 # Get data on the fernet tokens
 TOKEN_CHECK=$(/usr/bin/fetch_fernet_tokens.py -t {{ fernet_token_expiry }} -n {{ (groups['keystone'] | length) + 1 }})