Disable 1934 on stream and trace configurations.

It fails when trying to instrument the thread stacks.

Bug: 67384421
Test: ./test/testrunner/testrunner.py --host --trace --stream --ntrace \
                                      -t 1934

Change-Id: Icb70cb9cad664bb78c39f1c7acc123994a8011c8
diff --git a/test/knownfailures.json b/test/knownfailures.json
index df24c7d..229d618 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -1,5 +1,11 @@
 [
     {
+        "tests": "1934-jvmti-signal-thread",
+        "description": ["Disables 1934-jvmti-signal-thread in tracing configurations"],
+        "variant": "trace | stream",
+        "bug": "http://b/67384421"
+    },
+    {
         "tests": "153-reference-stress",
         "description": ["Disable 153-reference-stress temporarily until a fix",
                         "arrives."],