Update dependency ruamel.yaml to v0.17.10

Update dependency napalm to v3.3.1

Update dependency ruamel.yaml to v0.17.9

Update dependency ruamel.yaml to v0.17.8

Update dependency ruamel.yaml to v0.17.7

Update dependency ruamel.yaml to v0.17.6

Update dependency napalm to v3.3.0

Update dependency django-auth-ldap to v2.4.0

Update dependency ruamel.yaml to v0.17.4

Update dependency ruamel.yaml to v0.17.2

Update dependency ruamel.yaml to v0.17.0

Update dependency ruamel.yaml to v0.16.13

Update dependency django-auth-ldap to v2.3.0

Provide backends for django-storages in our images

Update dependency django-storages to v1.11.1

Update of ruamel.yaml

Gunicorn is replaced with nginx-unit ...

We now serve Netbox with an nginx-unit instance instead of Gunicorn.
This allows us to get rid of the extra Nginx container because Unit is
also serving the static files. The static files are now collected at container
buildtime instead of every startup.