Life is too short to update md5sum by hand.

  git clone of slapos.cookbook-repository is already present on slapos stack.

Added password generation and monitoring to jupyter instances. Todo: Password editing at the monitor.

A redo of [this](nexedi/slapos!148) merge request. I messed up with some merge conflicts on the old one and thought it would be faster to make a new one...

@alain.takoudjou  @Tyagov 

/reviewed-on nexedi/slapos!156

stack/slapos: version up zc.buildout 2.5.2+slapos007 to solve issues with very long shebang scripts.

This reverts commit 515795ea

  Move instance-monitor.cfg to buildout.hash.cfg

/reviewed-on nexedi/slapos!151

/reviewed-on nexedi/slapos!154

  Include report for apache status (see mod_status on apache documentation)
  Include report to traffic server to produce a summary on cache
  Update report for ats for run only once an hour

  It is protected with monitor password.

also install logrotate binary under ${logrotate:location}/sbin instead
of ${logrotate:location}/usr/sbin, still keeping the backward compatibility.

https://jira.mariadb.org/browse/MDEV-12281

This reverts commit b4e440ed

/reviewed-on !147