INT-4507: Use UNLINK in RedisMessageStore if any

JIRA: https://jira.spring.io/browse/INT-4507

* Add `RedisUtils` with the `isUnlinkAvailable()` to check the Redis
server version to be sure that `UNLINK` is available or not
* Use `RedisUtils.isUnlinkAvailable()` in the `RedisMessageStore` and
`RedisLockRegistry` when a removal functionality is performed
* Add `AbstractKeyValueMessageStore.doRemoveAll(Collection<Object> ids)`
for optimization
* Implement `doRemoveAll()` in the `RedisMessageStore` and
`GemfireMessageStore`

**Cherry-pick to 5.0.x**

spring-integration-gemfire/src/main/java/org/springframework/integration/gemfire/store/GemfireMessageStore.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -96,6 +96,11 @@ public class GemfireMessageStore extends AbstractKeyValueMessageStore {
 		return this.messageStoreRegion.remove(id);
 	}
 
+	@Override
+	protected void doRemoveAll(Collection<Object> ids) {
+		this.messageStoreRegion.removeAll(ids);
+	}
+
 	@Override
 	protected Collection<?> doListKeys(String keyPattern) {
 		Assert.hasText(keyPattern, "'keyPattern' must not be empty");