Sample config file changes

Rename config.yml to dev-config.yml

Add example-config.yml, a simple configuration file for the official
This was originally made for the the distribution-library-image repo,
but is being moved here to make sure it stays in sync.

Update Dockerfile and docs for the rename.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>

Dockerfile

@@ -15,4 +15,4 @@ RUN make PREFIX=/go clean binaries
 VOLUME ["/var/lib/registry"]
 EXPOSE 5000
 ENTRYPOINT ["registry"]
-CMD ["cmd/registry/config.yml"]
+CMD ["cmd/registry/dev-config.yml"]

cmd/registry/example-config.yml

@@ -0,0 +1,14 @@
+version: 0.1
+log:
+  fields:
+    service: registry
+storage:
+    cache:
+        layerinfo: inmemory
+    filesystem:
+        rootdirectory: /var/lib/registry
+    maintenance:
+        uploadpurging:
+            enabled: false
+http:
+    addr: :5000

docs/building.md

@@ -45,7 +45,7 @@ The registry can be run with the default config using the following
 incantantation:
 
 ```
-$ $GOPATH/bin/registry $GOPATH/src/github.com/docker/distribution/cmd/registry/config.yml
+$ $GOPATH/bin/registry $GOPATH/src/github.com/docker/distribution/cmd/registry/dev-config.yml
 INFO[0000] endpoint local-5003 disabled, skipping        app.id=34bbec38-a91a-494a-9a3f-b72f9010081f version=v2.0.0-alpha.1+unknown
 INFO[0000] endpoint local-8083 disabled, skipping        app.id=34bbec38-a91a-494a-9a3f-b72f9010081f version=v2.0.0-alpha.1+unknown
 INFO[0000] listening on :5000                            app.id=34bbec38-a91a-494a-9a3f-b72f9010081f version=v2.0.0-alpha.1+unknown

docs/configuration.md

@@ -1552,7 +1552,7 @@ The above configures the registry instance to run on port `5000`, binding to
 verbose.
 
 A similar simple configuration is available at
-[config.yml](https://github.com/docker/distribution/blob/master/cmd/registry/config.yml).
+[example-config.yml](https://github.com/docker/distribution/blob/master/cmd/registry/example-config.yml).
 Both are generally useful for local development.