CSV import should accept the "slug" value for choice fields

[jeremystretch]

Environment

• Python version: 3.6.9
• NetBox version: 2.8.9

Proposed Functionality

For fields which specify one of several pre-defined choices, users should be able to specify the "slug" value rather than the proper string. For example, here are the available slug values and corresponding names for a rack's type:

Slug	Name
2-post-frame	2-post frame
4-post-frame	4-post frame
4-post-cabinet	4-post cabinet
wall-frame	Wall-mounted frame
wall-cabinet	Wall-mounted cabinet

It may make sense to use the slug value consistently for both import and export operations, though I'll leave that open for discussion.

Use Case

NetBox v2.7 replaced the old integer-based choice field IDs with human-friendly slugs. These are more convenient to handle when manipulating data, as extra attention is not needed to ensure correct capitalization, spacing, or punctuation. For example, it is quicker and simpler to write wall-frame than Wall-mounted frame, and the later provides no further information than the former within the context of data entry.

Database Changes

None

External Dependencies

None