Samarth Jain updated PHOENIX-3174:
    Attachment: PHOENIX-3174_v4_master.patch

Thanks for the review, [~jamestaylor]. Attached is the updated patch with tests 
added in UpgradeIT. I was also able to add a test for the concurrent upgrade 
scenario where an UpgradeInProgress exception is thrown. I also brought back 
the "do not upgrade" property since we do not want our server side code to 
unintentionally trigger upgrade when the autoupgrade property is set to true.

> Make minor upgrade a manual step
> --------------------------------
>                 Key: PHOENIX-3174
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3174
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: James Taylor
>            Assignee: Samarth Jain
>             Fix For: 4.9.0
>         Attachments: PHOENIX-3174.patch, PHOENIX-3174_v2.patch, 
> PHOENIX-3174_v3_master.patch, PHOENIX-3174_v4_master.patch
> Instead of automatically performing minor release upgrades to system tables 
> in an automated manner (on first connection), we should make upgrade a 
> separate manual step. If a newer client attempts to connect to a newer server 
> without the upgrade step having occurred, we'd fail the connection.
> Though not as automated, this would give users more control and visibility 
> into when an upgrade over system tables occurs.

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