OAS 2.0 - invalid basePath

[antaln]

Describe the bug

Per OAS 2.0:

basePath is the URL prefix for all API paths, relative to the host root. It must start with a leading slash /. If basePath is not specified, it defaults to /, that is, all paths start at the host root.

This is causing OAS 2.0 validators (e.g. go-openapi) to fail with error basePath in body should match '^/'

Reproduction steps

1. python vmsgen.py -vc <host> -oas 2 -o <dir>
2. observe that resulting oas2 specs have basePath set to empty string.

Expected behavior

'basePath' should either be omitted entirely, or set to '/'.

Additional context

No response