Dockerfile-test: move to "tests"

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

Makefile

@@ -75,11 +75,11 @@ endif
 
 build-docker-test:
 	$(info GO_VERSION: $(GO_VERSION))
-	@sed -i.bak 's|REPLACE_ME_GO_VERSION|$(GO_VERSION)|g' ./Dockerfile-test
+	@sed -i.bak 's|REPLACE_ME_GO_VERSION|$(GO_VERSION)|g' ./tests/Dockerfile
 	docker build \
 	  --tag gcr.io/etcd-development/etcd-test:go$(GO_VERSION) \
-	  --file ./Dockerfile-test .
-	@mv ./Dockerfile-test.bak ./Dockerfile-test
+	  --file ./tests/Dockerfile .
+	@mv ./tests/Dockerfile.bak ./tests/Dockerfile
 
 push-docker-test:
 	$(info GO_VERSION: $(GO_VERSION))

Dockerfile-test → tests/Dockerfile

@@ -15,7 +15,7 @@ RUN dnf check-update || true \
 ENV GOROOT /usr/local/go
 ENV GOPATH /go
 ENV PATH ${GOPATH}/bin:${GOROOT}/bin:${PATH}
-ENV GO_VERSION REPLACE_ME_GO_VERSION
+ENV GO_VERSION 1.10.1
 ENV GO_DOWNLOAD_URL https://storage.googleapis.com/golang
 RUN rm -rf ${GOROOT} \
   && curl -s ${GO_DOWNLOAD_URL}/go${GO_VERSION}.linux-amd64.tar.gz | tar -v -C /usr/local/ -xz \