Fix IPv4 operations where v6only behavior is default

Some configurations disable dual stack sockets.  For example
if net.ipv6.bindv6only is 1 in linux, pyghmi was failing.
Address by explicitly requesting the converse behavior
on the socket since we explicitly do want to not care
whether a particular socket is engaged in ipv4 or ipv6
activity.

Change-Id: I17a16f0ebe4752ca743f115af39a367670691507