Merge pull request #3320 from weaveworks/manifest-tool-make

Fix manifest-tool cmd in Makefile

Makefile

@@ -117,7 +117,7 @@ WEAVEWAIT_NOMCAST_EXE=prog/weavewait/weavewait_nomcast
 WEAVEUTIL_EXE=prog/weaveutil/weaveutil
 RUNNER_EXE=tools/runner/runner
 # manifest-tool needs registry credentials; we assume here that the active user has logged in
-MANIFEST_TOOL_CMD="docker run --rm -v $(HOME)/.docker:/.docker weshigbee/manifest-tool --docker-cfg=/.docker"
+MANIFEST_TOOL_CMD=docker run --rm -v $(HOME)/.docker:/.docker weshigbee/manifest-tool --docker-cfg=/.docker
 TEST_TLS_EXE=test/tls/tls
 NETWORKTESTER_EXE=test/images/network-tester/webserver