Issue#336 - Remove deprecated AbstractKafkaAvroSerDeConfig usage

[saurabh-slacklife]

1. Removed AbstractKafkaAvroSerDeConfig usage
2. Removed unused imports.

Local tested with regular mvn lifecycle: compile and test

#336

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[mjsax]

Thanks for the PR. I think we also need to update

• GenericAvroScalaIntegrationTest.scala
• SpecificAvroScalaIntegrationTest.scala

[saurabh-slacklife]

Thanks for the PR. I think we also need to update

• GenericAvroScalaIntegrationTest.scala
• SpecificAvroScalaIntegrationTest.scala

@mjsax It's updated with scala changes.