Move IFDH commands into config file
Right now, in the jobsub dropbox cleanup tool, the ifdh commands are run by calling a general IfdhCmd function that will
1. Grab the IFDH executable from the config file
2. Grab the command and arguments from the func's own arguments (e.g. "rm <file>")
3. Put those together with a context and run the command as an exec.CommandContext.
(2) is done by higher level wrapper functions for each kind of ifdh command (ll, rm, rmdir). I want to generalize this so that we can move the creation of the argument string of ifdh to the config file as a template (similar to how voms-proxy-init commands are done).
This is a low priority item.