Update sshkey utils to provide and check exit status

Added an example shell script that contains basic set up for using updated
utils

refs #14097
sshkeys.sh: Remove trailing -o to fix error

refs #14097
Merge branch 'bug/14097' into develop

* bug/14097:
  sshkeys.sh: Remove trailing -o to fix error
  Update sshkey utils to provide and check exit status