Add marathon label to configure basic auth, similar to docker and rancher providers

templates/marathon.tmpl

@@ -34,6 +34,9 @@
   priority = {{getPriority .}}
   entryPoints = [{{range getEntryPoints .}}
     "{{.}}",
+  {{end}}]
+  basicAuth = [{{range getBasicAuth .}}
+    "{{.}}",
   {{end}}]
     [frontends."frontend{{.ID | replace "/" "-"}}".routes."route-host{{.ID | replace "/" "-"}}"]
     rule = "{{getFrontendRule .}}"