Introduce a Lettuce-based fault-tolerant Redis cluster accessor.

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

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+package org.whispersystems.textsecuregcm.configuration;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import javax.validation.Valid;
+import javax.validation.constraints.NotEmpty;
+import javax.validation.constraints.NotNull;
+import java.util.List;
+
+public class RedisClusterConfiguration {
+
+    @JsonProperty
+    @NotEmpty
+    private List<String> urls;
+
+    @JsonProperty
+    @NotNull
+    @Valid
+    private CircuitBreakerConfiguration circuitBreaker = new CircuitBreakerConfiguration();
+
+    public List<String> getUrls() {
+        return urls;
+    }
+
+    public CircuitBreakerConfiguration getCircuitBreakerConfiguration() {
+        return circuitBreaker;
+    }
+}