Update config templates to Havana release

Use upstreams password-validator configuration.

Don't set SESSION_ENGINE to cached_db but rather use upstream's default
(signed_cookies). This way, Django's session backend doesn't access the
database anymoe. The table "django_sessions" could stay in the DB if
present, it doesn't hurt.

COMPRESS_OFFLINE is not needed on SUSE anymore after upstream moved to
python-lesscpy (instead of nodejs / lessc).
Add 'external_monitoring' configurable.

Allows to pass links to external workload (guest VM) monitoring solutions
(such as Nagios or Ganglia) to be displayed in the OpenStack dashboard.

Due to Crowbar's strict JSON validation rules, we can't pass a Hash but
have to use an array instead. Odd entries are link names and even ones
are link URLS, e.g.:

  Nagios, http://nagios.mycloud.com, Ganglia, http://ganglia.else.where

Please note that is independent from Crowbar'S Nagios barclamp, which
monitors the Cloud infrastructure.
Enable cisco external router configuration

The 'router' dashboard Django app is enabled by default and will be
used.