commit 87ac083a3b72ee3462f15b296dde541e07797daf
author Junyu Lai <junyulai@google.com> Wed May 29 22:34:02 2019 -0700
committer Junyu Lai <junyulai@google.com> Thu May 30 06:26:52 2019 +0000
tree c02d95ccffa0fa91da60531023780c0b5865f0b2
parent 3cdc25cbc47e08c1f216f18cdedeb3a9337301e7

Fix keepalive CTS fail for devices with kernel older than 4.8

If kernel < 4.8 then it doesn't support get socket option
TCP_REPAIR_WINDOW, thus TCP keepalive cannot be supported.
However, it might still support NAT-T keepalive. Test TCP
keepalive only if it is supported by kernel.

Bug: 133652079
Test: atest android.net.cts.ConnectivityManagerTest#testMajorMinorVersionCompare \
    android.net.cts.ConnectivityManagerTest#testSocketKeepaliveLimit \
    android.net.cts.ConnectivityManagerTest#testSocketKeepaliveUnprivileged \
    android.net.cts.ConnectivityManagerTest#testKeepaliveUnsupported \
    android.net.cts.ConnectivityManagerTest#testCreateTcpKeepalive

Change-Id: I0a3ff07c482bb7c8cb05663678c10afcc0500861
Merged-In: I3f8456deea2b4ded762a413c8e27b58ce54ce0aa
(cherry picked from commit 57d91e6276b50bf0dd78f3643c4a979f584fcf38)