Use vendoring when building test runner

Makefile

@@ -162,7 +162,7 @@ tools/.git:
 	git submodule update --init
 
 $(RUNNER_EXE): tools/.git
-	make -C tools/runner
+	GO15VENDOREXPERIMENT=1 make -C tools/runner
 
 $(PUBLISH): publish_%: $(IMAGES_UPTODATE)
 	$(SUDO) DOCKER_HOST=$(DOCKER_HOST) docker tag  $(DOCKERHUB_USER)/$* $(DOCKERHUB_USER)/$*:$(WEAVE_VERSION)

vagrant-common.rb

@@ -1,4 +1,4 @@
-$go_version = "1.4.2"
+$go_version = "1.5.2"
 
 $go_path = "/usr/local/go/bin"