fix test/snapshot and maven repo call in buildfile
fix test/snapshot and maven repo call in buildfile

mpoehler/gradle-appengine-plugin,ArseniKavalchuk/gradle-appengine-plugin,GoogleCloudPlatform/gradle-appengine-plugin,MGronber/gradle-appengine-plugin,judeebene/gradle-appengine-plugin,loosebazooka/gradle-appengine-plugin