Rename dev-config.yml and example-config.yml to config-dev.yml and config-example.yml

Better for sort order.

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

cmd/registry/config-dev.yml

@@ -0,0 +1,60 @@
+version: 0.1
+log:
+  level: debug
+  fields:
+    service: registry
+    environment: development
+  hooks:
+    - type: mail
+      disabled: true
+      levels:
+        - panic
+      options:
+        smtp:
+          addr: mail.example.com:25
+          username: mailuser
+          password: password
+          insecure: true
+        from: sender@example.com
+        to:
+          - errors@example.com
+storage:
+    delete:
+      enabled: true
+    cache:
+        blobdescriptor: redis
+    filesystem:
+        rootdirectory: /var/lib/registry
+    maintenance:
+        uploadpurging:
+            enabled: false
+http:
+    addr: :5000
+    debug:
+        addr: localhost:5001
+redis:
+  addr: localhost:6379
+  pool:
+    maxidle: 16
+    maxactive: 64
+    idletimeout: 300s
+  dialtimeout: 10ms
+  readtimeout: 10ms
+  writetimeout: 10ms
+notifications:
+    endpoints:
+        - name: local-5003
+          url: http://localhost:5003/callback
+          headers:
+             Authorization: [Bearer <an example token>]
+          timeout: 1s
+          threshold: 10
+          backoff: 1s
+          disabled: true
+        - name: local-8083
+          url: http://localhost:8083/callback
+          timeout: 1s
+          threshold: 10
+          backoff: 1s
+          disabled: true 
+