Update Rack Initializer for Netbox 2.7

The rack database model has changed in Netbox 2.7.
Therefore the initializer code, that was used before, broke.
As a user, you will need to update your racks.yml file as follows:

- Rack types must match one of the 5 rack types given, e.g.
  '4-post-cabinet'.
- Rack width must match one of the 2 rack widths given, i.e. '19' or
  '23'.

See the diff of this commit for further information how this is meant.

startup_scripts/080_racks.py

@@ -1,7 +1,6 @@
 from dcim.models import Site, RackRole, Rack, RackGroup
 from tenancy.models import Tenant
 from extras.models import CustomField, CustomFieldValue
-from dcim.constants import RACK_TYPE_CHOICES, RACK_WIDTH_CHOICES
 from ruamel.yaml import YAML
 from pathlib import Path
 import sys
@@ -41,14 +40,6 @@ with file.open('r') as stream:
 
           params[assoc] = model.objects.get(**query)
 
-      for rack_type in RACK_TYPE_CHOICES:
-        if params['type'] in rack_type:
-          params['type'] = rack_type[0]
-
-      for rack_width in RACK_WIDTH_CHOICES:
-        if params['width'] in rack_width:
-          params['width'] = rack_width[0]
-
       rack, created = Rack.objects.get_or_create(**params)
 
       if created: