Handle unknown fields in sampler APIs response (#425)

Author: srprash

aws-xray-recorder-sdk-core/src/main/java/com/amazonaws/xray/internal/UnsignedXrayClient.java

@@ -26,6 +26,7 @@
 import com.fasterxml.jackson.annotation.JsonInclude.Include;
 import com.fasterxml.jackson.core.JsonParser;
 import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.PropertyName;
 import com.fasterxml.jackson.databind.PropertyNamingStrategies;
@@ -61,6 +62,7 @@ public class UnsignedXrayClient {
 
     // Visible for testing
     static final ObjectMapper OBJECT_MAPPER = new ObjectMapper()
+            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
             .setSerializationInclusion(Include.NON_EMPTY)
             .setPropertyNamingStrategy(PropertyNamingStrategies.UPPER_CAMEL_CASE)
             .registerModule(new SimpleModule().addDeserializer(Date.class, new FloatDateDeserializer()))

aws-xray-recorder-sdk-core/src/test/java/com/amazonaws/xray/internal/UnsignedXrayClientTest.java

@@ -175,7 +175,8 @@ public class UnsignedXrayClientTest {
         + "            \"FixedRate\": 0.1,\n"
         + "            \"ReservoirQuota\": 2,\n"
         + "            \"ReservoirQuotaTTL\": 1530923107.0,\n"
-        + "            \"Interval\": 10\n"
+        + "            \"Interval\": 10,\n"
+        + "            \"Foo\": \"bar\"\n"
         + "        },\n"
         + "        {\n"
         + "            \"RuleName\": \"polling-scorekeep\",\n"