Exclude config context from devices list request in NetBox by default

[dgarros]

By default, NetBox is returning the config_context with the devices when querying the devices list in the API. When the list of devices is large, the config context can add a significant delay.

Since we are not leveraging information from the config context right now in the inventory, it's preferable to exclude the config context by default when we are querying the list of devices to improve the response time

This PR exclude the config context by default in the NetBox inventory

[lampwins]

Not at all precluding this PR, but keep an eye on netbox-community/netbox#4559 which is meant to address performance issues with rendering of config context.

[dgarros]

thanks @lampwins, good to know