Change 17.02 API to make node Port parameter available to the clients.

17.02 API has been changed so that node Port parameter is now packed and
unpacked on REQUEST_NODE_INFO RPC. 'scontrol write config' is now able to
write the Port on each of the node lines in the output file. Same way,
'scontrol show node' now displays the Port parameter too. 'sinfo' is able
to display the Port through -o "%j" or the -O "port" sinfo format string.
Default --long --Node sinfo output now includes the PORT too and sinfo is
also able to sort ascending/descending by Port through -S +/-j. sinfo man
page has been update accordingly. 'sview' also displays the Port when
displaying the full node information. Update of the Port parameter is not
supported through the clients.

Bug 3240