Update VLAN Initializer for Netbox 2.7

The VLAN 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 vlans.yml file as follows:

- Make sure the status is spelled lowercase.

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

initializers/vlans.yml

@@ -1,11 +1,19 @@
+## Possible Choices:
+##   status:
+##   - active
+##   - reserved
+##   - deprecated
+##
+## Examples:
+
 # - name: vlan1
 #   site: AMS 1
-#   status: Active
+#   status: active
 #   vid: 5
 #   role: Main Management
 #   description: VLAN 5 for MGMT
 # - group: VLAN group 2
 #   name: vlan2
 #   site: AMS 1
-#   status: Active
+#   status: active
 #   vid: 1300