Commits on Nov 14, 2016

1. Make ZMQ_TOS work with IPv6 sockets …

   Summary:
   To set `Type Of Service` for IP layer packets ZMQ provides `ZMQ_TOS` socket
   option. However this only works for v4 sockets. Considering things are moving to
   IPv6 heavily (especially within enterprise networks), ZMQ should support setting
   `traffic class` for v6 based on `ZMQ_TOS`.
   
   There is a subtle difference between v4 and v6 in terms of the positioning of
   field but TOS has same meaning in both v4 and v6. Linux provides following APIs
   for v4/v6 to set TOS field value.
   ```
   // For v4
   setsockopt(fd, IPPROTO_IP, IP_TOS, tos, sizeof(tos));
   
   // For v6
   setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, tos, sizeof(tos));
   ```
   
   Test Plan:
   Make sure Cmake works fine and all tests passes.
   Imported this change to `OpenR` project and tested on our local testbed.
   Captured some packets exchanged between PUB/SUB and ROUTER/ROUTER sockets
   pairs. Verify that `TCLASS` value is set as per expectation.
   
   Tasks: zeromq#2208

   

   saifhhasan committed Nov 14, 2016
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