## What is the purpose of the change

This pull request fix the arbitrary iterator access on RocksDBMapIterator to 
avoid unexpected exception.

## Brief change log

Fix the `RocksDBMapIterator#loadCache()` logical to add not-removed `lastEntry` 
as the first entry in `cacheEntries`. 

## Verifying this change

This change added tests and can be verified as follows:
  - Added unit test for `StateBackendTestBase#testMapState()`

## Does this pull request potentially affect one of the following parts:

  - Dependencies (does it add or upgrade a dependency):  no
  - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: no
  - The serializers: no
  - The runtime per-record code paths (performance sensitive): don't know
  - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: no
  - The S3 file system connector: no

## Documentation

  - Does this pull request introduce a new feature?  no


[ Full content available at: https://github.com/apache/flink/pull/6638 ]
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