Major rework of the script interface to Emulab. Up to now we have been
supporting both a shell script driven interface, plus the newer XMLRPC interface. This change removes the script driven interface from boss, replacing it with just the XMLRPC interface. Since we like to maintain backwards compatability with interfaces we have advertised to users (and which we know are being used), I have implemented a script wrapper that exports the same interface, but which converts the operations into XMLRPC requests to the server. This wrapper is written in python and uses our locally grown xmlrpc-over-ssh library. Like the current "demonstation" client, you can take this wrapper to your machine that has python and ssh installed, and use it there; you do not need to use these services from just users.emulab.net. Other things to note: * The wrapper is a single python script that has a "class" for each wrapped script. Running the wrapper without any arguments will list all of the operations it supports. You can in...