Apache NiFi 1.6.0 release vote helper for RC3

[Joe Witt <jo...@apache.org>]

Hello Apache NiFi community,

Please find the associated guidance to help those interested in
validating/verifying the release so they can vote.

# Download latest KEYS file:
https://dist.apache.org/repos/dist/dev/nifi/KEYS

# Import keys file:
gpg --import KEYS

# [optional] Clear out local maven artifact repository

# Pull down nifi-1.6.0 source release artifacts for review:

wget https://dist.apache.org/repos/dist/dev/nifi/nifi-1.6.0/nifi-1.6.0-source-release.zip
wget https://dist.apache.org/repos/dist/dev/nifi/nifi-1.6.0/nifi-1.6.0-source-release.zip.asc
wget https://dist.apache.org/repos/dist/dev/nifi/nifi-1.6.0/nifi-1.6.0-source-release.zip.sha1
wget https://dist.apache.org/repos/dist/dev/nifi/nifi-1.6.0/nifi-1.6.0-source-release.zip.sha256
wget https://dist.apache.org/repos/dist/dev/nifi/nifi-1.6.0/nifi-1.6.0-source-release.zip.sha512

# Verify the signature
gpg --verify nifi-1.6.0-source-release.zip.asc

# Verify the hashes (sha1, sha256, sha512) match the source and what
was provided in the vote email thread
shasum -a 1 nifi-1.6.0-source-release.zip
shasum -a 256 nifi-1.6.0-source-release.zip
shasum -a 512 nifi-1.6.0-source-release.zip

# Unzip nifi-1.6.0-source-release.zip

# Verify the build works including release audit tool (RAT) checks
cd nifi-1.6.0
mvn clean install -Pcontrib-check,include-grpc

# Verify the contents contain a good README, NOTICE, and LICENSE.

# Verify the git commit ID is correct

# Verify the RC was branched off the correct git commit ID

# Look at the resulting convenience binary as found in nifi-assembly/target

# Make sure the README, NOTICE, and LICENSE are present and correct

# Run the resulting convenience binary and make sure it works as expected

# Send a response to the vote thread indicating a +1, 0, -1 based on
your findings.

Thank you for your time and effort to validate the release!