THRIFT-4295: rework the docker build images, updating them and tuning the travis builds

This closes #1340
diff --git a/test/tests.json b/test/tests.json
index 818982e..2b84601 100644
--- a/test/tests.json
+++ b/test/tests.json
@@ -160,7 +160,7 @@
       ]
     },
     "client": {
-      "timeout": 2.9,
+      "timeout": 6,
       "command": [
         "node",
         "client.js",