[VOTE] Release Apache Traffic Control RELEASE-6.0.0-RC1

[Zach Hoffman]

I've prepared a release for 6.0.0-RC1. Changes since RELEASE-5.1.2:

        
https://github.com/apache/trafficcontrol/compare/RELEASE-5.1.2...RELEASE-6.0.0-RC1
        
https://github.com/apache/trafficcontrol/blob/RELEASE-6.0.0-RC1/CHANGELOG.md

The artifacts are available for download at:

        https://dist.apache.org/repos/dist/dev/trafficcontrol/6.0.0/RC1/

BLAKE2 checksum:
252c0d82575c6b922744e861a3499bb2f6810c6ee878323a79407f1325bdc0d4e86ffc9328952047f609c7d693f12c49bf3b5d2758b2ed334ad5af3eef443f80
  apache-trafficcontrol-6.0.0.tar.gz

SHA512 checksum:
143e6e37a569d3f0a177985e62ab39ad7e7953e1c64ca7344f9ab2b03197eea38b1f6106fa07cb7c44e095390f1aab7c86398fc76f03d3d7cd6a8895c24b2511
  apache-trafficcontrol-6.0.0.tar.gz

This corresponds to git refs:

        Hash: 912f8ff30e582b1c565ca3db3af910d9853752c7
        Tag: RELEASE-6.0.0-RC1

Which can be verified with the following command:

        $ git tag -v RELEASE-6.0.0-RC1

All code signing keys are available here:

        https://dist.apache.org/repos/dist/release/trafficcontrol/KEYS

Make sure you refresh from a key server to get all relevant signatures.

The vote is open until 22:00 UTC on Wednesday, September 8 and passes if a 
majority of at least 3 +1 PMC votes are cast.
        [ ] +1 approve
        [ ] +0 no opinion
        [ ] -1 disapprove (and reason why)

-Zach