lets base on the SERF image
lets start ambari via serf event handlers instead of bootstrap.sh
hostname should be fictive (ambari.com is taken)
port expose is not need, it makes `docker ps` messy
pseudo cluster
ambari-functions added
entrypoint-cmd issue fixed
entrypoint/cmd simplified
usage added to header
j.mp address fixed in curl
default CMD added to overwrite messy CMD in warmuped ambari image
fixing CMD to be json

otherwise images starting with
  entrypoint= [/usr/local/serf/bin/start-serf-agent.sh]
  cmd= [/bin/sh -c --log-level debug]
deleting comment
adding entrypoint as default to be safe when starting handcommited images
README fixed
add ssh with KEYCHAIN function
update README
image tag fixed in REAMDE
system-auth is moved to the docker-ssh repo