[HBASE-24803] Unify hbase-shell ::Shell::Commands::Command#help behavior

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.3.0
• Fix Version/s: 3.0.0-alpha-1, 2.4.0
• Component/s: shell
• Hadoop Flags: Reviewed
• Assignee: Elliot Miller
• Reporter: Elliot Miller
• Created: 30/Jul/20 19:22
• Updated: 01/Aug/20 19:00
• Resolved: 31/Jul/20 14:44

Description

This is a small patch to unify shell help:

• Many of the commands use different indentation levels to style the help text.
• A few commands printed help instead of returning it, which breaks our pattern.

I also added a test to make sure the help text stays consistent after this patch.

Issue Links

• is related to: HBASE-24672 HBase Shell Commands Survey
• links to: GitHub Pull Request #2178