Disallow the 'anonymous' user (if defined) from using the rcExecCmd
API function.

This is an additional safety precaution, so that only authenticated
users can run the scripts in server/bin/cmd.  If your site needs to
allow this for some particular feature, you can remove the check.


git-svn-id: svn://irodssvn.ucsd.edu/trunk@5592 ea137bd6-aa86-47b6-b90d-b101d9f19a90