Agniva De Sarker c82c37a36e MM-28067: Optimize app server startup in tests (#16263)
* MM-28067: Optimize app server startup in tests

For every test, we would wipe out the database and then start
the server again. This would run through all the migrations
and create new rows in Systems and Roles table every time.
As a result, this was consuming a lot of setup time for every test.

We optimize this by preloading the DB with dummy data in the roles
and systems table so that the server code just skips over those migrations.
This is completely forward compatible and adding new migrations does not
need to generate the sql files again. Only in case of schema changes to the
roles or systems table, this would need to be done.

It is unlikely the Systems table schema will get changed. The Roles table
might change in future but it's a comparatively rare event. Given the reduction
in CI runtime we are seeing, it's a worthy optimization.

We also apply some more optimizations:
- Coalesce multiple UpdateConfig calls into a single one. Each UpdateConfig call
has to do a json marshal which would take precious CPU cycles. It's much more
efficient to do everything in a single call.
- Remove unnecessary debug.FreeOSMemory in reload config. This was an artifact
from old days and is no longer required.

Numbers:
Results show a full **2 minutes** shaved off the test runtime. Earlier, tests
would take around 16 minutes. Now they take 14 minutes.

```release-note
NONE
```

* fix app package
2020-11-16 13:55:32 +01:00
2020-01-23 12:34:29 +01:00
2020-10-27 15:58:38 +01:00
2020-11-09 11:32:21 +01:00
2020-03-13 18:35:31 +01:00
2019-04-04 09:49:07 -04:00
2018-05-30 10:23:25 -04:00
2020-10-27 15:58:38 +01:00
2020-11-09 11:49:04 +01:00

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