Add bazlets

This project appears in dependency cycles with other projects that
use Zuul, so we should add it to the list of known projects to
avoid errors.

Change-Id: I53fbd2dd8f04c119104be0ee5b37d670d12f5a86

zuul/main.yaml

diff --git a/zuul/main.yaml b/zuul/main.yaml
index 667733f..3675c31 100644
--- a/zuul/main.yaml
+++ b/zuul/main.yaml
@@ -31,6 +31,7 @@
           - plugins/webhooks
           - polymer-bridges
           # All of the rest of the projects, alphabetically sorted.
+          - bazlets
           - java-prettify
           - plugins/admin-console
           - plugins/autosubmitter