[VOTE] Pulsar Release 2.2.0 Candidate 2

This is the Second release candidate for Apache Pulsar, version 2.2.0 Release 2.2.0 adds new features and also fixes for various issues from 2.1.1 * Pulsar Java Client Interceptors * Integration of functions and io with schema registry * Dead Letter Topic * Flink Source connector * JDBC Sin

Build failed in Jenkins: pulsar_release_nightly_snapshot #238

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