The file_list will be iterated more than once, and filter in python3
is being consumed, so create a list instead for many iterations.

os.errno does not exists since python 3.7

in https://lab.nexedi.com/nexedi/slapos/blob/master/stack/monitor/templates/monitor-httpd.conf.in there is no such thing as `/share/public/` URL

/reviewed-on nexedi/slapos.toolbox!71

As bootstrapMonitor is run many times and each execution takes taime it's
better to have the status file there during monitor is running, especially if
previous runs were good.

This file is used by other tools to check last state of bootstrap monitor, and
if it disappears for execution of monitor it can result with false alarms.

/reviewed-on nexedi/slapos.toolbox!70

Since etc/promise was migrated to etc/plugin a lot of installations are
without etc/promise folder, and monitor configuration is without
legacy-promise-folder option.

/reviewed-on nexedi/slapos.toolbox!69

/reviewed-on nexedi/slapos.toolbox!51

Additionally print exact exception message.

/reviewed-on nexedi/slapos.toolbox!56

/reviewed-on nexedi/slapos.toolbox!34

promise are run by slapgrid now, monitor will collect result and generate final files
monitor runpromise script can be used to test a promise (which is implemented on the new promise design)
remove all generated script and logrotate code from monitor.py, they will be added in buildout

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.

some jio folders are not needed anymore, webdav is only needed for config folder.
Report results are placed in documents folder so they will not be synced automatically (we can get then when needed)
Use UTC timezone in json result instead of local time.

  File can be empty for whatever reason, so handle it in the same way the file don't exist.

  Consider the last start date to not include same entry multiple times

monitor_config_write: CORS apache conf should be rendered from a slapos template instead of being hardcoded