Store container id for use in link/oif naming fallback

'link-outer-dev normally creates a friendly name for the outer link
device using a combination of service and device name; however, if that
string is look long, the fallback strategy is to use a portion of the
container id. Unfortunately the id key was removed during a refactoring,
which introduced the regression.

src/conlink/core.cljs

@@ -663,7 +663,8 @@ General Options:
     [container (inspect-container container-obj)
      clabels (get-compose-labels container)
      svc-num (:container-number clabels)]
-    {:name (->> container :Name (re-seq #"(.*/)?(.*)") first last)
+    {:id (:Id container)
+     :name (->> container :Name (re-seq #"(.*/)?(.*)") first last)
      :index (if svc-num (js/parseInt svc-num) 1)
      :service (:service clabels)
      :pid (-> container :State :Pid)