[jira] [Created] (IGNITE-19093) Create standalone MetaStorage implementation for test purposes

["Andrey Mashenkov (Jira)" <ji...@apache.org>]

Andrey Mashenkov created IGNITE-19093:
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             Summary: Create standalone MetaStorage implementation for test purposes
                 Key: IGNITE-19093
                 URL: https://issues.apache.org/jira/browse/IGNITE-19093
             Project: Ignite
          Issue Type: Improvement
            Reporter: Andrey Mashenkov
            Assignee: Andrey Mashenkov
             Fix For: 3.0.0-beta2


*Motivation.*
Some components depends on MetaStorage API and doesn’t tested well.
In tests, we either have to create 100500 mocks, which doesn’t implement any quasi-real behaviour (e.g. we skip serialization step), or have to implement end-to-end test and start-up real nodes.

See {{DistributionZoneManagerConfigurationChangesTest}}
Here, initialization of all the mocks looks longer than the tests themselves.
And we copy-paste this boilerplate code everywhere, when we need a bit more than stupid stub.

*Suggestion*
Let's 
* create standalone version of MetaStorage for test purposes, which will just push raft command directly to a metastorage listener.
* replace boilerplate code in tests with new metastorage implementation.



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