[LOS-571] fix cern-get-keytab samba integration
- fix call to '/usr/bin/net' in newer versions of samba
- ensure cern-get-keytab works for cifs on C8 as well
GitLab service scheduled maintenance on Friday, March 21st 2025 as of 08h00 Geneva time for an estimated period of 1 hour. Further information under OTG0154918.