Convert netsock.h over to use ast_sockaddrs rather than sockaddr_in and update

chan_iax2 to pass in the correct types.

chan_iax2 is the only consumer for the various ast_netsock_* functions in trunk
at this point, so this feels like a safe change to make.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@357005 65c4cc65-6c06-0410-ace0-fbb531ad65f3