Improve make receipe for connecting minion.

Seems saltstack 2014.7 needs the minion key to be deleted.
Also stop and start the minion explicitly instead of restart.
Remove use of unstable alt bootstrap script.

Uncertain why we used this in the first place.
(Noticed the following WARN: Running the unstable version of bootstrap-salt.sh).
Remove obsolete refs to 'dfb'-server in pillar.