Set a timeout for Redis cluster operations and shut down the cluster as part of service shutdown

service/src/main/java/org/whispersystems/textsecuregcm/configuration/RedisClusterConfiguration.java

@@ -5,6 +5,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import javax.validation.Valid;
 import javax.validation.constraints.NotEmpty;
 import javax.validation.constraints.NotNull;
+import java.time.Duration;
 import java.util.List;
 
 public class RedisClusterConfiguration {
@@ -13,6 +14,10 @@ public class RedisClusterConfiguration {
     @NotEmpty
     private List<String> urls;
 
+    @JsonProperty
+    @NotNull
+    private Duration timeout = Duration.ofSeconds(2);
+
     @JsonProperty
     @NotNull
     @Valid
@@ -22,6 +27,10 @@ public class RedisClusterConfiguration {
         return urls;
     }
 
+    public Duration getTimeout() {
+        return timeout;
+    }
+
     public CircuitBreakerConfiguration getCircuitBreakerConfiguration() {
         return circuitBreaker;
     }