JIRA: https://jira.spring.io/browse/INT-4176
The `DelayerHandlerRescheduleIntegrationTests` doesn't close `context` in the end of test.
That causes clashes for `beanFactoryResolver` in other tests.
When those tests are fail, we come into condition when new processes can't be started/stopped because of effect of non-stopped context
* Fix all the `DelayerHandlerRescheduleIntegrationTests` to stop `context` in the end of test
* Remove unused files in the `gemfire/store` test package
* Add current date value to the `CacheServerProcess` name to avoid clashes with other ran on the same host
* Add NPE check for `region` in the `GemfireMetadataStoreTests`
* Extract `@BeforeClass/@AfterClass` for the `CacheWritingMessageHandlerTests` to start only one Gemfire cache per class
**Cherry-pick to 4.3.x & 4.2.x**
9078a74a19