Forgot to USE_MOD_VENDOR in #61 (#62)

* Reintroduce USE_MOD_VENDOR, which got dropped

* Add test before pulling as it should be faster

makefile_components/base_build_go.mak

@@ -12,16 +12,18 @@ DOCKERBUILDCMD=docker run -t --rm -u $(shell id -u):$(shell id -g)
           	    -e CGO_ENABLED=0                  \
           	    -e GOOS=$@						  \
           	    -e GOPATH="//workdir/$(GOTMP)" \
+          	    -e GOFLAGS="$(USEMODVENDOR)" \
           	    -w //workdir              \
           	    $(BUILD_IMAGE)
 
 DOCKERTESTCMD=docker run -t --rm -u $(shell id -u):$(shell id -g)                    \
           	    -v "$(S)$(PWD):/workdir$(DOCKERMOUNTFLAG)"                              \
           	    -e GOPATH="//workdir/$(GOTMP)" \
+          	    -e GOFLAGS="$(USEMODVENDOR)" \
           	    -w //workdir              \
           	    $(BUILD_IMAGE)
 
-.PHONY: all build test push clean container-clean bin-clean version static gofmt govet golint golangci-lint container
+.PHONY: all build test push clean container-clean bin-clean version static gofmt govet golint golangci-lint container pull
 GOTMP=.gotmp
 
 SHELL = /bin/bash
@@ -73,8 +75,10 @@ ifneq ($(DOCKER_TOOLBOX_INSTALL_PATH),)
 endif
 
 build: $(BUILD_OS)
+
 pull:
-	@docker pull $(BUILD_IMAGE) >/dev/null 2>&1
+	@if [[ "$(docker images -q $(BUILD_IMAGE)  2> /dev/null)" == "" ]]; then docker pull $(BUILD_IMAGE) >/dev/null 2>&1; fi
+
 
 linux darwin windows: pull $(GOFILES)
 	@echo "building $@ from $(SRC_AND_UNDER)"