monitor: move scripts wrapper and logrotate conf to buildout, uses some new promises from slapos.toolbox

monitor was updated in slapos.toolbox to not generate promise launcher scripts anymore. All
generated scripts are now in buildout.
Monitor promise run script is removed from cron, slapgrid is used to run promises.
Replace some old promises by the new ones from slapos.toolbox. Cleanup monitor configuration.
Monitor report and monitor-promises directory are now obsolete.

This is a follow-up of commit 5c980caf,
now that the new code of the 'wrapper' recipe is used (1.0.58 released).

stack/monitor: Create srv/monitor/private/monitor-log directory. It is specified by slapos.monitor.monitor.Monitoring.

stack/monitor: Add a random delay of maximum 60 seconds to all monitor cron jobs to avoid high load at the first second of every minute.

Revert "stack/monitor: Add a random delay of maximum 60 seconds to all monitor cron jobs to avoid high load at the first second of every minute."

This reverts commit 677a80e4.

stack/monitor: Add a random delay of maximum 60 seconds to all monitor cron jobs to avoid high load at the first second of every minute.

@Nicolas , @rafael , @klaus  please review.

/reviewed-on !276

/reviewed-on !172

/reviewed-on !169

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

A redo of [this](!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 !156

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

When a process is stopped:
- it may not have emitted logs since previous rotation: add "missingok"
  As a direct consequence: stop using logrotate recipe.
- its pid file (if applicable) may be missing: test its non-empty presence
  before calling slapos-kill
Also, stop using slapos.cookbook:logrotate.
Update obvious users (cloudooo, neoppod, erp5, monitor, re6stnet).

  Kill -0 were making the promise exit.