Add AWS ECS provider

* add ecs provider

* add ecs docs

* fix test after rebase

* add provider icon

* add missing addProvider call

* Fix for review

* Fix documentation

* Fix for review

* Fix documentation

* fix ctx usage

* autoDiscoverClusters setDefaults false

* Fix for review

* review: doc.

* Fix for review: add ctx in backoff retry

* review: linter.

Co-authored-by: Michael <michael.matur@gmail.com>
Co-authored-by: romain <romain@containo.us>
Co-authored-by: Fernandez Ludovic <ludovic@containo.us>

docs/content/reference/static-configuration/file.yaml

@@ -161,6 +161,18 @@ providers:
       httpAuth:
         username: foobar
         password: foobar
+  ecs:
+    constraints: foobar
+    exposedByDefault: true
+    refreshSeconds: 42
+    defaultRule: foobar
+    clusters:
+    - foobar
+    - foobar
+    autoDiscoverClusters: true
+    region: foobar
+    accessKeyID: foobar
+    secretAccessKey: foobar
   consul:
     rootKey: foobar
     endpoints:
@@ -250,6 +262,7 @@ metrics:
 ping:
   entryPoint: foobar
   manualRouting: true
+  terminatingStatusCode: 42
 log:
   level: foobar
   filePath: foobar