IpSecManagerTest: Increase time to wait for packets

"Not enough traffic was recorded to satisfy the provided conditions" is
a commonly seen flake. This change increases the timeout value
arbitrarily to hopefully fix some of those failures.

I have not looked at the test in detail, so it is entirely possible that
this will not fix anything.

Test: TH
Bug: 270135449
Change-Id: I31b14c560c21f2942a87b88e75e5aca0a3b1c270
diff --git a/tests/cts/net/src/android/net/cts/IpSecManagerTest.java b/tests/cts/net/src/android/net/cts/IpSecManagerTest.java
index 4fa0080..9c30811 100644
--- a/tests/cts/net/src/android/net/cts/IpSecManagerTest.java
+++ b/tests/cts/net/src/android/net/cts/IpSecManagerTest.java
@@ -395,7 +395,7 @@
     private static class StatsChecker {
         private static final double ERROR_MARGIN_BYTES = 1.05;
         private static final double ERROR_MARGIN_PKTS = 1.05;
-        private static final int MAX_WAIT_TIME_MILLIS = 1000;
+        private static final int MAX_WAIT_TIME_MILLIS = 3000;
 
         private static long uidTxBytes;
         private static long uidRxBytes;