Kerberos/AFS token renewal for WMAgent submitting to LSF

A WMAgent configured for local CERN submission would need to wrap call to start the agent in a k5reauth to automatically renew Kerberos/AFS tokens. As this is only functional at CERN, it needs to be optional. Last time Samir looked at it, there was a problem getting getopts option parsing to work within the manage script.

Not very urgent as we do not have many WMAgents submitting locally to CERN and it's a one line patch that can easily be applied manually after deployment.

Still, would be good if this can be integrated into the manage script.