Milestone PGTools: S3.b Prepare tools for export to other Emulab sites

• Right now, they run fine with the Utah Emulab acting as the front-end (including instantiating slivers on other aggregates), but work and documentation are needed for other Emulab sites to be able to act as front-ends.

Status: The Emulab frontend to ProtoGENI has been cleaned up an generalized, so that other Emulab sites participating in ProtoGENI can enable it for their users. The University of Kentucky has been the first external site to test this feature.

Though not originally part of this milestone, we have also made changes to the map client to make it easier to host it on sites other than protogeni.net.