kubernetes: rename images to better reflect what they are.

`linuxkitprojects/kubernetes` → `linuxkitprojects/kubelet`
`linuxkitprojects/kubernetes-image-cache-*` → `linuxkitprojects/kubernetes-docker-image-cache-*`

`kubernetes` subdirectory is also renamed to `kubelet`.

`image-cache` subdirectory is not renamed since we may want to build other
sorts of image cache at some point.

Signed-off-by: Ian Campbell <ijc@docker.com>

projects/kubernetes/Makefile

@@ -13,13 +13,13 @@ KUBE_FORMAT_ARGS := $(patsubst %,-format %,$(KUBE_FORMATS))
 all: build-container-images build-vm-images
 
 build-container-images:
-	linuxkit pkg build kubernetes
+	linuxkit pkg build kubelet
 
 build-cache-images:
 	$(MAKE) -C image-cache build
 
 push-container-images:
-	linuxkit pkg push kubernetes
+	linuxkit pkg push kubelet
 	$(MAKE) -C image-cache push
 
 build-vm-images: kube-master.iso kube-node.iso

projects/kubernetes/image-cache/build.yml.in

@@ -1,5 +1,5 @@
 org: linuxkitprojects
-image: kubernetes-image-cache-@@CACHE@@
+image: kubernetes-docker-image-cache-@@CACHE@@
 disable-content-trust: true
 arches:
   - amd64

projects/kubernetes/kubelet/build.yml

@@ -1,5 +1,5 @@
 org: linuxkitprojects
-image: kubernetes
+image: kubelet
 network: true
 disable-content-trust: true
 arches: