Merge pull request #1144 in SNORT/snort3 from metapacket to master

Merge pull request #1144 in SNORT/snort3 from metapacket to master

Squashed commit of the following:

commit e6660bd853546dd1de7a708a9bc84f2bf922765d
Author: Victor Roemer (viroemer) <viroemer@cisco.com>
Date:   Tue Mar 27 16:29:28 2018 -0400

    fix

commit 2dc5713408cb250ba89e74298e99437063b1509d
Author: Victor Roemer (viroemer) <viroemer@cisco.com>
Date:   Fri Mar 16 14:44:14 2018 -0400

    sfip: A version of set() which automatically determines the family

commit 2386b17110b3ae536cde1f9481414510a3e7173d
Author: Victor Roemer (viroemer) <viroemer@cisco.com>
Date:   Tue Mar 13 15:59:27 2018 -0400

    flow: SO_PUBLIC FlowKey