Create extended RemoteCacheManager for testing purposes

The extended RemoteCacheManager should expose details such as the following:

• transportFactory

The implementation should be internal and NOT part of public API.

This way we can get rid of reflection in tests for HotRod client and these tests can be reused for C++ and C# HotRod clients. Any tests that use reflection are currently unusable for those implementations.
The ultimate goal is to extend the test suite for C++ and C# clients.