Increase connection_max_retries to 480 secs on CentOS jobs

Jobs run on non-nested virtualization environments (TCG) which
significantly slows down amphora instances at boot. CentOS-based
amphorae seem to take even longer for unknown reasons on TCG
environments. This patch increases connection_max_retries from default
300 seconds to 480 seconds on CentOS jobs.

Change-Id: Ib304cc12fcca51aab30f6dbe78ae412a8c358717
diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index db5e924..2ad1cf5 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -379,6 +379,12 @@
         OCTAVIA_AMP_BASE_OS: centos
         OCTAVIA_AMP_DISTRIBUTION_RELEASE_ID: 7
         OCTAVIA_AMP_IMAGE_SIZE: 3
+      devstack_local_conf:
+        post-config:
+          $OCTAVIA_CONF:
+            haproxy_amphora:
+              # Set these higher for non-nested virt nodepool instances
+              connection_max_retries: 480
 
 - job:
     name: octavia-v2-dsvm-scenario-ubuntu-bionic
@@ -524,6 +530,11 @@
         OCTAVIA_AMP_DISTRIBUTION_RELEASE_ID: 7
         OCTAVIA_AMP_IMAGE_SIZE: 3
       devstack_local_conf:
+        post-config:
+          $OCTAVIA_CONF:
+            haproxy_amphora:
+              # Set these higher for non-nested virt nodepool instances
+              connection_max_retries: 480
         test-config:
           "$TEMPEST_CONFIG":
             load_balancer: