Disable ListeningPortsTest

The test is originally introduced to help device manufacturers
to catch security vulnerabilities that would occur when they
ship by mistake a debugging daemon with open ports.

However the increased use of mDNS and other services triggered
a too high level of false negatives.

Hence the test is being disabled now, and will be reintroduced
later on when there is a better way to address the false
negatives.

Bug: 31803630
Change-Id: Ibdd6cc3b2075abf2959f017c319485b77a30fc45
diff --git a/tests/expectations/knownfailures.txt b/tests/expectations/knownfailures.txt
index 149a196..284719e 100644
--- a/tests/expectations/knownfailures.txt
+++ b/tests/expectations/knownfailures.txt
@@ -1,5 +1,12 @@
 [
 {
+  description: "Disable ListeningPortsTest",
+  names: [
+    "android.security.cts.ListeningPortsTest"
+  ],
+  bug: 31803630
+},
+{
   description: "some AlarmClockTests are not robust across different device types",
   names: [
     "android.alarmclock.cts.DismissAlarmTest#testAll",