Fix TypeError in QoSBandwidthAndPacketRateTests

[1] Added random int to flavor name but that resulted into
TypeError: can only concatenate str (not "int") to str.

Concatenate using % operator to fix it.

Also make tempest-full-ussuri-py3 job non-voting temporary
to unblock gate, can be reverted once [2] is fixed.

[1] https://review.opendev.org/c/openstack/tempest/+/826946
[2] https://launchpad.net/bugs/1959600

Related-Bug: #1959467
Change-Id: I76e15b6b52bb44fec550ead510186c644c4a1c7f
diff --git a/zuul.d/project.yaml b/zuul.d/project.yaml
index 731a72a..2d4f10a 100644
--- a/zuul.d/project.yaml
+++ b/zuul.d/project.yaml
@@ -42,6 +42,7 @@
         - tempest-full-victoria-py3:
             irrelevant-files: *tempest-irrelevant-files
         - tempest-full-ussuri-py3:
+            voting: false
             irrelevant-files: *tempest-irrelevant-files
         - tempest-multinode-full-py3:
             irrelevant-files: *tempest-irrelevant-files