Merge "Remove NATT keepalive from IpSecTransform" am: c20770fee5 am: 89a98351ee am: 8397f75d51

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1512881

Change-Id: I53320999a962c12f7cef9fe804616e62071fce1f