AvroSerializer not found in import *

[Amertz08]

Description

Looks like "AvroSerializer" is defined in __all__ for __init__.py under the root package. This causes an attribute error on from confluent_kafka import *

    from confluent_kafka import *
E   AttributeError: module 'confluent_kafka' has no attribute 'AvroSerializer'

How to reproduce

Try from confluent_kafka import *.

confluent-kafka[avro]==1.4.1

Checklist

Please provide the following information:

confluent-kafka[avro]==1.4.1
librdkafk ('1.4.0', 17039615)
Mac OSX

• confluent-kafka-python and librdkafka version (confluent_kafka.version() and confluent_kafka.libversion()):
• Apache Kafka broker version:
• Client configuration: {...}
• Operating system:
• Provide client logs (with 'debug': '..' as necessary)
• Provide broker log excerpts
• Critical issue