Bump test timeout

We're working through some Mitaka gate issues, this should
help temporarily

Change-Id: I97b95b3961a9d66059ee142b3c1ba7707c2f4da2
diff --git a/designate_tempest_plugin/config.py b/designate_tempest_plugin/config.py
index 8552015..0310cba 100644
--- a/designate_tempest_plugin/config.py
+++ b/designate_tempest_plugin/config.py
@@ -38,7 +38,7 @@
                default=1,
                help="Time in seconds between build status checks."),
     cfg.IntOpt('build_timeout',
-               default=240,
+               default=360,
                help="Timeout in seconds to wait for an resource to build."),
     cfg.IntOpt('min_ttl',
                default=1,