Fix LockRegLeaderInitiator for interrupted Thread

https://build.spring.io/browse/INT-MASTER-1024

When the Lettuce Redis client catches an `InterruptedException`, it is
wrapped to the `RedisCommandInterruptedException`, therefore when we
catch an exception on our code level it is not an `InterruptedException`
anymore and we can't proceed in the loop because the tread is
`interrupted` already.

* Check the `interrupted` alongside with the `InterruptedException`
to restart a loop from a fresh thread.

**Cherry-pick to 5.0.x**

(cherry picked from commit fc47952)

Author: artembilan

spring-integration-core/src/main/java/org/springframework/integration/support/leader/LockRegistryLeaderInitiator.java

@@ -398,7 +398,7 @@ else if (acquired) {
 							}
 						}
 
-						if (e instanceof InterruptedException) {
+						if (e instanceof InterruptedException || Thread.currentThread().isInterrupted()) {
 							Thread.currentThread().interrupt();
 							if (isRunning()) {
 								logger.warn("Restarting LeaderSelector because of error.", e);