api: rename parameter 'userid' to 'username'

restapi/embedded_spec.go

restapi/handlers/user-apikey-add.go

restapi/handlers/user-apikey-delete.go

restapi/handlers/user-delete.go

restapi/handlers/user-get.go

restapi/handlers/user-password-delete.go

restapi/handlers/user-password-set.go

restapi/handlers/user-update.go

restapi/operations/logging.go

restapi/operations/prometheus.go

restapi/operations/rednerd_api.go

restapi/operations/user_management/user_apikey_add.go

.../operations/user_management/user_apikey_add_parameters.go

.../operations/user_management/user_apikey_add_urlbuilder.go

restapi/operations/user_management/user_apikey_delete.go

...erations/user_management/user_apikey_delete_parameters.go

...erations/user_management/user_apikey_delete_urlbuilder.go

restapi/operations/user_management/user_apikey_list.go

...operations/user_management/user_apikey_list_parameters.go

...operations/user_management/user_apikey_list_urlbuilder.go