correctly sending over port file to all nodes, as before, appengine nodes would always use 8080
Merge pull request #787 from shatterednirvana/properly-updating-port-file

correctly sending over port file to all nodes
removing port files when taking down appscale, to prevent future deployments from reading in stale values
Merge pull request #788 from shatterednirvana/remove-port-files-on-clean

removing port files when taking down appscale