SE-2321 Adds forum environment variable MONGOID_AUTH_MECH

Description

Will be set in `devstack_forum_env` by https://github.com/edx/configuration/pull/5755, but required here so that people don't have to fully rebuild their devstacks when https://github.com/edx/cs_comments_service/pull/316 merges.

*JIRA tickets*: OSPR

*Discussions*: [Discussion forum errors in latest master with mongo 3.2](https://discuss.openedx.org/t/discussion-forum-errors-in-latest-master-with-mongo-3-2/1843/5)

*Dependencies*: Relates to https://github.com/edx/configuration/pull/5755, https://github.com/edx/cs_comments_service/pull/316

*Sandbox URL*: See https://github.com/edx/cs_comments_service/pull/316

*Merge deadline*: ASAP, fix needed for Juniper.

*Testing instructions*:

See https://github.com/edx/cs_comments_service/pull/316

*Reviewers*

  • [ ] @toxinu

  • [ ] edX reviewer[s] TBD

FYI @bderusha

Assignee

Unassigned

Reporter

Open Source Pull Request Bot

Labels

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Contributor Name

Jillian Vogel

Repo

edx/devstack

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Configure