fixed kestone fernet prechecks for multinode deployments

command fails since it is a compound command. Changed to a single awk
command instead.

Closes-Bug: #1629206

Change-Id: Id7963b15c3321eca6f891a625b1ba140dc57aa22

ansible/roles/prechecks/tasks/service_checks.yml

@@ -45,7 +45,7 @@
 
 - name: Checking fernet_token_expiry in globals.yml. Update fernet_token_expiry to allowed value if this task fails
   run_once: true
-  local_action: command grep '^[^#]*fernet_token_expiry:\s*\d*' "{{ CONFIG_DIR }}/globals.yml" | sed 's/[^0-9]*//g'
+  local_action: command awk '/^fernet_token_expiry/ { print $2 }' "{{ CONFIG_DIR }}/globals.yml"
   register: result
   changed_when: false
   failed_when: result.stdout | regex_replace('(60|120|180|240|300|360|600|720|900|1200|1800|3600|7200|10800|14400|21600|28800|43200|86400|604800)', '') | search(".+")