v1.6.0-rc4

What's Changed

• Disable NCL tests as it is the default protocol by @wdbaruni in #4741
• compute node backward compatibility with v1.5 orchestrators by @wdbaruni in #4761
• improve orchestrator node self-registeration by @wdbaruni in #4762
• more human readable logging pattern by @wdbaruni in #4763
• fix lint failing due to sqlite3 missing by @wdbaruni in #4767
• better exchange of starting seqNum during handshakes by @wdbaruni in #4766
• Add Shutdown Notice from Compute Nodes by @wdbaruni in #4769
• Fix race conditions resulting in multiple data planes by @wdbaruni in #4771
• Faster reconnect on handshake required response by @wdbaruni in #4772
• Handle watchers with future sequence numbers gracefully by @wdbaruni in #4773
• Propagate bacerrors over nclprotocol by @wdbaruni in #4774

Full Changelog: v1.6.0-rc3...v1.6.0-rc4