Add sysadmin/netconfig

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
etc/hosts: speed up iptables by defining host names

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
ssl: add link to ssllabs' viewMyClient page

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>