Import upstream change: Support Solaris SO_FLOW_SLA socket option

Upstream Change:

    8032808: Support Solaris SO_FLOW_SLA socket option
    Reviewed-by: alanb, chegar

    http://hg.openjdk.java.net/jdk8u/jdk8u/jdk/rev/7f04532ee859

The change has no effect for Linux/Android, however we keep it to
minimize local diff.

Bug: 29067535
Change-Id: I3748377ef382545424a6af720fc97d204f677d09