As discussed in PR#305, these are defaults that even if they are
configurable as probably not suited to a majority of users and causes
delete/add output on highstate of user of the formula choses to use
the same file name.
This commit also provides a more concrete example of a 'host' to
be saltified. Users can do
salt-cloud -p make_salty someinstance
or
salt-cloud -m /etc/salt/cloud.maps.d/foo.conf
Either which way the online docs should really be updated with more
concrete examples.
