The following tests seems to attach "not master" error messages to error codes like NotWritablePrimary when constructing errors. We should investigate whether these strings are necessary, otherwise we should change them to "not primary" to be more in line with the new error messages we'll return with the hello command:
dist_lock_catalog_impl_test
replset_dist_lock_manager_test
sharding_catalog_client_test
sharding_catalog_write_retry_test
sessions_collection_sharded_test