GA release v2.0.3

Changes since last release: v2.0.2...v2.0.3

Notable changes:

• Better support for 5.6->5.7 replication with Pseudo-GTID (Booking.com contribution)
• Docket image improvmenets (@calind contribution)
• More detailed timing metrics for discoveries, backend latencies etc. (Booking.com contribution)
• Logging improvements (Booking.com contribution)
• supporting SkipOrchestratorDatabaseUpdate and PanicIfDifferentDatabaseDeploy
• relaxation of health expiry writes (Booking.com contribution)
• support for PseudoGTIDPreferIndependentMultiMatch

and many more. Special thanks to @sjmudd!