Added email-ext plugin

Change-Id: I95d548f08f9880bb0dc6d367b9f77453b3cee2d9
diff --git a/jenkins/client/init.yml b/jenkins/client/init.yml
index ab057df..58a53a6 100644
--- a/jenkins/client/init.yml
+++ b/jenkins/client/init.yml
@@ -24,6 +24,7 @@
         description-setter: {}
         discard-old-build: {}
         docker-workflow: {}
+        email-ext-plugin: {}
         extended-choice-parameter: {}
         extensible-choice-parameter: {}
         gerrit-trigger: {}