Prepare for Netbox 2.7

Merge branch 'master' into patch-2

Add SSLMODE to database connection properties ...

Defaulting to SSLMODE=prefer, optional override using environment variable: DB_SSLMODE

Add CONN_MAX_AGE to database connection settings ...

Defaulting to 300 seconds for the database connection to avoid new connection setup roundtrip on consecutive requests

Add support for custom scripts ...

Custom scripts were added to Netbox in version 2.6.3. This adds a new
directory to the image where custom scripts can be placed.

Merge branch 'patch-1' of https://github.com/miso231/netbox-docker into miso231-patch-1

%s/digitalocean/netbox-community/gi ...

Thank you Digitalocean for sponsoring Netbox!
And thank you for letting it grow up and move out ;)

Retype REDIS_PORT to int

Provides necessary changes for v2.6 compatibility ...

Fixes #139

Add AUTH_LDAP_GROUP_TYPE env variable support ...

Dynamically imports the correct class/subclass from django_auth_ldap.config based on the AUTH_LDAP_GROUP_TYPE environment variable.

Merge branch 'mryauch-patch-1' of https://github.com/mryauch/netbox-docker into mryauch-mryauch-patch-1

AUTH_LDAP_BIND_PASSWORD secret file support

Add support for using SSL connections to Redis.

Code style improvements

ldap_config: resolve AUTH_LDAP_USER_SEARCH_ATTR and AUTH_LDAP_GROUP_SEARCH_CLASS from env

Remove duplicated entry in `configuration.py`

🐞 REDIS_PORT should be int ...

Closes #96

♻️ Make netbox-worker it's own container ...

One container should ideally have one responsibility [1]. Therefore I
implemented the netbox-worker to start in it's own container. This is
possible, because netbox and the worker communicate via redis anyway.

They still use the same image underneath, just the "command" they
execute while starting different.

Or in other words: I see no reason to introduce supervisord, when we
already have docker-compose which can take care of running multiple
processes.

Also, here's another benefit: Now it's possible to view the logs of the
webhook worker independently of the other netbox logs (and vice-versa).

Other changes in this commit:
* I don't see a reason to put a password for Redis in the docker-compose
  setup, so I removed it.
* Slightly changed the nginx config, so that the nginx startup command
  becomes simpler and any error should be visible in the docker log.
* Some housekeeping in the `Dockerfile`.
* Added some troubleshooting advice regarding webhooks to the README.

I'd like to thank Brady (@bdlamprecht [2]) here who did the harder
work of figuring out what's even required to have webhooks working. [3]

[1] 
https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#decouple-applications
[2] https://github.com/bdlamprecht
[3] https://github.com/ninech/netbox-docker/pull/90

✨ Disable webhooks by default* ...

*but enable it by default for anyone who checks out the netbox-docker project
via the netbox.env file.

✨ Read redis password like any other secret

Working implementation of webhooks using new 'redis' container

Merge branch 'master' into master

Update ldap_config.py

Change default value of AUTH_LDAP_USER_DN_TEMPLATE

Add auth-ldap-user-dn-template in ldap_config.py

resolve AUTH_LDAP_GROUP_CACHE_TIMEOUT from env ...

Resolve ValueError: invalid literal for int() for AUTH_LDAP_GROUP_CACHE_TIMEOUT

add allow all hosts by default

Move config to /etc/netbox/config (Fixes #54) ...

With this the configuration is moved to /etc/netbox/config and the
default reports directory is set to /etc/netbox/reports. This enables
the user to mount reports from a config map or persistent volume in
OpenShift.

🐞 Parse config correctly ...

Fixes #56

Externalize gunicorn-config ...

This moves the gunicorn_config.py into /etc/netbox so that it can be
easily mapped through a Openshift config map