Import upstream change: Setting IP_TOS on java.net sockets not working on unix

Upstream change:

    8072384: Setting IP_TOS on java.net sockets not working on unix
    Reviewed-by: michaelm

    http://hg.openjdk.java.net/jdk8u/jdk8u/jdk/rev/3767befecb32

Bug: 29067535
Test: Passes CTS tests
Change-Id: I08dc3bdee860062d23e181a43bcde88a728d44c2