Most include do not expect salt to be something else than the usual salt
variable giving access to all the salt modules. Instead we use cfg_salt.
And for consistency we rename the master/minion variables to
cfg_master/cfg_minion too.
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.
