Spec: Ability to change a public channel into a private group

Description

From: https://forum.mattermost.org/t/convert-a-private-channel-to-public-channel-and-vice-versa/695

Spec: https://docs.google.com/a/mattermost.com/document/d/1kMfdvUFOXfH5IfLwJ07SUWJzdNhIrIW2JOJ7DcOst5U/edit?usp=sharing

Needed for importing private Slack channels by making them public, importing, then making them private--we should test to make sure to test this scenario specifically.

This would be pretty awesome, because it would let users get at the private data in Slack that is otherwise kept away from users.

QA Test Steps

None

Status

Mana

None

Assignee

Lindsay Brock

Reporter

Ian Tien

Epic Link

None

Fix versions

None

Mattermost Team

None

Sprint

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Labels

GitHub Issue

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