Align behaviour of in-memory and redis mult repos

The in-memory version has to force the incoming metric keys to
start with the group name. Redis doesn't have that restriction
but normally we expect both to be used in such a way that
the metric keys already match the prefix. In that case the two
repositories behave the same now in terms of set and get.

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/repository/redis/RedisMultiMetricRepository.java

@@ -144,12 +144,8 @@ public class RedisMultiMetricRepository implements MultiMetricRepository {
 	}
 
 	private Metric<?> deserialize(String group, String redisKey, String v, Double value) {
-		String prefix = group;
-		if (!group.endsWith(".")) {
-			prefix = group + ".";
-		}
 		Date timestamp = new Date(Long.valueOf(v));
-		return new Metric<Double>(prefix + nameFor(redisKey), value, timestamp);
+		return new Metric<Double>(nameFor(redisKey), value, timestamp);
 	}
 
 	private String serialize(Metric<?> entity) {

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/repository/InMemoryPrefixMetricRepositoryTests.java

@@ -82,9 +82,9 @@ public class InMemoryPrefixMetricRepositoryTests {
 
 	@Test
 	public void incrementGroup() {
-		this.repository.increment("foo", new Delta<Number>("bar", 1));
-		this.repository.increment("foo", new Delta<Number>("bar", 2));
-		this.repository.increment("foo", new Delta<Number>("spam", 1));
+		this.repository.increment("foo", new Delta<Number>("foo.bar", 1));
+		this.repository.increment("foo", new Delta<Number>("foo.bar", 2));
+		this.repository.increment("foo", new Delta<Number>("foo.spam", 1));
 		Set<String> names = new HashSet<String>();
 		for (Metric<?> metric : this.repository.findAll("foo")) {
 			names.add(metric.getName());

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/repository/redis/RedisMultiMetricRepositoryTests.java

@@ -116,9 +116,9 @@ public class RedisMultiMetricRepositoryTests {
 
 	@Test
 	public void increment() {
-		this.repository.increment("foo", new Delta<Number>("bar", 1));
-		this.repository.increment("foo", new Delta<Number>("bar", 2));
-		this.repository.increment("foo", new Delta<Number>("spam", 1));
+		this.repository.increment("foo", new Delta<Number>("foo.bar", 1));
+		this.repository.increment("foo", new Delta<Number>("foo.bar", 2));
+		this.repository.increment("foo", new Delta<Number>("foo.spam", 1));
 		Metric<?> bar = null;
 		Set<String> names = new HashSet<String>();
 		for (Metric<?> metric : this.repository.findAll("foo")) {