Rename all Filterset to be compliant with Nautobot naming convention

[dgarros]

Environment

• Python version: 3.7
• Nautobot version: 1.1.3
• nautobot-golden-config version: develop

Steps to Reproduce

1. Check the name of the filterset defined in filters.py

Expected Behavior

Following, Nautobot naming convention the filterset should be named <ModelName>FilterSet
it's especially important for GraphQL when we are using @extras_feature because if the name of the filterset is not correct the GraphQL type generated by @extras_feature will miss the filtering options

Extras_feature for GraphQL is leverating the function get_filterset_for_model from nautobot/utilities/utils

Observed Behavior

The filterset are named <ModelName>Filter instead of <ModelName>FilterSet and as a result filtering is not available in GraphQL