fix: a combo of closing / opening shards leads to consumer not starting

[amalinovskiy]

Fixes #167

[pivotal-issuemaster]

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[artembilan]

Please, consider to fix Checkstyle violations:

> Task :checkstyleTest FAILED

[ant:checkstyle] [ERROR] /home/travis/build/spring-projects/spring-integration-aws/src/test/java/org/springframework/integration/aws/inbound/KinesisMessageDrivenChannelAdapterTests.java:21:15: Unused import - org.junit.jupiter.api.Assertions.assertTrue. [UnusedImports]

Run gradlew check instead of test locally.

Thanks

[artembilan]

Oh! I got it now:

kinesis handles adding a shard by closing a shard and opening 2 new instead, creating a scenario where it

So, good catch and thank you for contribution.

Merging...