Avoid the need to specify vendors explicitly in *JoinConfig models

Upstream reference: 546dad1a0a1af20fb58eb5be60be87f0ed2cd13f

Fix example code in README

Upstream reference: 97ec1bbbcb999ce75095c8c695dafd361b34da9c

Initial commit.

Upstream reference: c51bfc533f681ae2c21d20b35faff28340a4003e