Add a build job with -fsanitize=threads

Change-Id: Ib48a584ed0310d7a0e6409baf194f11149a441dd
diff --git a/zuul.yaml b/zuul.yaml
index 6aee5c9..297d140 100644
--- a/zuul.yaml
+++ b/zuul.yaml
@@ -65,6 +65,12 @@
     parent: run-ci-build-sh
 
 - job:
+    name: f29-clang-tsan
+    description: |
+      Build on Fedora 29 with clang and TSAN thread sanitizer.
+    parent: run-ci-build-sh
+
+- job:
     name: clang-format
     description: |
       Lint the current change via git-clang-format