Removed unneeded Variables from image gate and update latest

BRANCH, CHANGE, and PATCHSET are not needed
as parameters for image build process. These
are only necessary for tagging, and have been
moved into the LABEL string. Also added latest
tagging process for quay.io repo.

Change-Id: Iced74768a81f1e64da49175b33ae55b1bc3d6403

Makefile

@@ -20,6 +20,7 @@ LABEL                      ?= miscellaneous
 COMMIT                     := $(shell git rev-parse HEAD)
 PROXY                      ?= http://foo.proxy.com:8000
 PUSH_IMAGE                 ?= false
+LATEST                     := latest
 NO_PROXY                   ?= localhost,127.0.0.1,.svc.cluster.local
 USE_PROXY                  ?= false
 RANGER_USER                ?= ranger
@@ -30,7 +31,7 @@ IMAGE_DIR:=images/$(IMAGE_NAME)
 .PHONY: images
 images: $(IMAGE_NAME)
  $(IMAGE_NAME):
-	@echo " "
+	@echo "  "
 	@echo "===== Processing [$@] image ====="
 	@make build_$@ IMAGE=${DOCKER_REGISTRY}/${IMAGE_PREFIX}/$@:${COMMIT} IMAGE_DIR=images/$@ IMAGE_NAME=$@
 
@@ -68,6 +69,8 @@ endif
 
 ifeq ($(PUSH_IMAGE), true)
 	docker push $(IMAGE)
+	docker tag $(IMAGE) ${DOCKER_REGISTRY}/${IMAGE_PREFIX}/ranger:latest
+	docker push ${DOCKER_REGISTRY}/${IMAGE_PREFIX}/ranger:latest
 endif
 
 .PHONY: build_rangercli

tools/zuul/playbooks/docker-image-build.yaml

@@ -73,9 +73,6 @@
             chdir: "{{ zuul.project.src_dir }}"
             target: images
             params:
-              BRANCH: "{{ zuul.branch | default('') }}"
-              CHANGE: "{{ zuul.change | default('')  }}"
-              PATCHSET: "{{ zuul.patchset | default('')  }}"
               LABEL: "org.label-schema.vcs-ref={{ zuul.patchset | default('')  }} --label org.label-schema.vcs-url={{ zuul.change | default('')  }} --label org.label-schema.version=0.1.0 --label org.label-schema.branch={{ zuul.branch | default('') }}"
               DOCKER_REGISTRY: "quay.io"
               IMAGE_PREFIX: "attcomdev"