INT-3352 RedisLockRegistry

JIRA: https://jira.spring.io/browse/INT-3352

Provid a global lock registry, initially for the correlating
message handlers.

INT-3252 Polishing

- Use a discrete key for each lock and use Redis EXPIRE
- Use an internal DefaultLockRegistry to improve latency
    when threads are using the same registry instance.

INT-3352 More Polish

- Put localLock.unlock() in a finally block.
- Unlock localLock if acquiring the RedisLock fails.

INT-3352 Polishing - PR Comments

- PR Comments
- Improve equals()

INT-3352 Add Aggregator Integration Test

- move lock registry to the `util` package
- Add an aggregator integration test

INT-3352 Add Distributed Aggregator Test

- Simulates a distributed environment with a shared message
    store and distinct lock registries.

INT-3352 More PR Comments

INT-3352 Add Multiple Registry Tests

- Add tests to verify expected behavior when different registries are used.
- Polish javadocs.

.gitignore

@@ -28,3 +28,4 @@ target
 vf.gf.dmn-*
 /atlassian-ide-plugin.xml
 hostkey.ser
+.springBeans

build.gradle

@@ -96,6 +96,7 @@ subprojects { subproject ->
 		saajApiVersion = '1.3.5'
 		saajImplVersion = '1.3.23'
 		servletApiVersion = '3.1.0'
+		slf4jVersion = "1.7.6"
 		smackVersion = '3.2.1'
 		springAmqpVersion = project.hasProperty('springAmqpVersion') ? project.springAmqpVersion : '1.3.1.RELEASE'
 		springDataMongoVersion = '1.1.1.RELEASE'
@@ -453,6 +454,7 @@ project('spring-integration-redis') {
 			exclude group: 'org.springframework'
 		}
 		testCompile "com.lambdaworks:lettuce:$lettuceVersion"
+		testCompile "org.slf4j:slf4j-log4j12:$slf4jVersion"
 	}
 }