jsonrpc: make TCPReactor IPv6 capable

Change-Id: I108c3f804476ace8b9b1f0c5cca3f9b196d1163b
Signed-off-by: huntxu <mhuntxu@gmail.com>
Reviewed-on: http://gerrit.ovirt.org/11740
Reviewed-by: Saggi Mizrahi <smizrahi@redhat.com>
Reviewed-by: Petr Šebek <psebek@redhat.com>
Tested-by: Petr Šebek <psebek@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>