Add octavia-lib to required projects

The Octavia tempest jobs requires octavia-lib to be in the required
projects list to pull in git versions with depends-on.
This patch adds octavia-lib to required projects.

Change-Id: Ie24d06a04ef900675f3287a57e413586faa81c95
diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index d53fa42..f8bcf32 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -37,6 +37,7 @@
     timeout: 7800
     required-projects:
       - openstack/octavia
+      - openstack/octavia-lib
       - openstack/octavia-tempest-plugin
       - openstack/python-octaviaclient
     pre-run: playbooks/Octavia-DSVM/pre.yaml