vs_bridge: Ensure existing external ids are updated

... and also the ids not included by the given list are purged.

Closes-Bug: #2043916
Change-Id: I058614b9113edd6e65238b924e5f474cab37946e

lib/puppet/provider/vs_bridge/ovs.rb

@@ -47,9 +47,13 @@ Puppet::Type.type(:vs_bridge).provide(:ovs) do
     old_ids = _split(get_external_ids(br))
     new_ids = _split(value)
 
-    new_ids.each_pair do |k,v|
+    new_ids.each do |k,v|
-      unless old_ids.has_key?(k)
+      vsctl('br-set-external-id', br, k, v)
-        vsctl('br-set-external-id', br, k, v)
+    end
+
+    old_ids.each do |k, v|
+      if ! new_ids.has_key?(k)
+        vsctl('br-set-external-id', br, k)
       end
     end
   end

releasenotes/notes/bug-2043916-069f122907b13bc8.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    The ``vs_bridge`` resource now updates existing keys when external ids are
+    set. Also, the keys not included by the given extenral ids are removed.