Merge changes I97ba5903,Icd80b368 into rvc-dev

* changes:
  Make VpnProfile.maxMtu default value match Ikev2VpnProfile
  Add negotiated DNS servers to VPN config

tests/net/java/com/android/internal/net/VpnProfileTest.java

@@ -65,7 +65,7 @@ public class VpnProfileTest {
         assertTrue(p.getAllowedAlgorithms() != null && p.getAllowedAlgorithms().isEmpty());
         assertFalse(p.isBypassable);
         assertFalse(p.isMetered);
-        assertEquals(1400, p.maxMtu);
+        assertEquals(1360, p.maxMtu);
         assertFalse(p.areAuthParamsInline);
     }