feat(MOS): support OpenMedia's hot standby

[olzzon]

About the Contributor

This PR is made on behalf of BBC

Type of Contribution

This is a Feature

Current Behavior

Currently the Primary and Secondary MOS connection are expected to be online at the same time.

New Behavior

OpenMedia treats the Secondary server as a Hot Standby, so it's not connected while Primary server is connected. To handle this, a "Hot Spare" option is added in settings to the Secondary server.

When hot spare is activated, status messages are:

• GOOD - When running on Primary, the status of Secondary is ignored.
• GOOD - When running on Secondary the status of Primary is is ignored.
• BAD - If neither Primary or Secondary is connected.

Testing Instructions

Connect MOS gateway to a 2 server OpenMedia setup.

Time Frame

We intend to finish the development on this feature in two weeks time.

Other Information

Status

• [ ] PR is ready to be reviewed.
• [ ] The functionality has been tested by the author.
• [ ] Relevant unit tests has been added / updated.
• [ ] Relevant documentation (code comments, system documentation) has been added / updated.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 57.87%. Comparing base (8b25212) to head (ce68543). Report is 140 commits behind head on release51.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release51 #1169 +/- ## ============================================= - Coverage 57.94% 57.87% -0.08% ============================================= Files 523 526 +3 Lines 84719 84955 +236 Branches 4415 2996 -1419 ============================================= + Hits 49094 49169 +75 - Misses 35570 35782 +212 + Partials 55 4 -51 ```

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