clean: Moved load of urlpatterns from plugins into adagios.urls module.
Added rekishi INFLUXDB settings into rekishi plugin conf.
staticfiles has been disabled.

see: https://github.com/savoirfairelinux/adagios/commit/67d6b19f11e0ca4bbc62cf302fdf1a01a983af8d
Fix: check 'res' inside backends "probe loop".

so that if it's falsy we continue with the next backend
Fix/Enh: _get_rekishi_url(): metric name must be url quoted "manually".

In fact, we should need it to be url quoted *twice* !

Because django fails to correctly compares - with its urlpatterns engine -
url path components if or when they contain '/'.
enh: state_history template: show all services having at least one problem, not 2.
Enh: status_log: also show host_name columns in display.
Implemented get_logs() for rekishi->influxdb.

And AdagiosInfluxDbSeriePoint class to wrap an influxdb list of series (being list of points) into something compatible with adagios needs.
Add: Enable snippets_log() case for rekishi.

snippets_log: better to use get_logs2().
Add: Enable state_history() case for rekishi.

a bit harder.
Add: Enable status_log() case for rekishi.

Better _status_log.