adds controlscripts dir to jython python.path option

Jeremy wanted to put some pagerank controlscript logic into a shared class. I couldn't import the file in local mode without adding the controlscripts directory to python.path. This was because the controlscript is being run in the pigscripts directory instead of its own directory. So we should fix that, but in case there's not time for that this sprint (would that break anything else?), here's a quick fix to add controlscripts dir to python.path.