Provide a deleteObject method in tests and make it so that tests cleanup after themselves (#33)

Author: kessplas

src/main/java/software/amazon/encryption/s3/S3EncryptionClient.java

@@ -11,10 +11,15 @@
 import software.amazon.awssdk.core.sync.RequestBody;
 import software.amazon.awssdk.core.sync.ResponseTransformer;
 import software.amazon.awssdk.services.s3.S3Client;
+import software.amazon.awssdk.services.s3.model.DeleteObjectRequest;
+import software.amazon.awssdk.services.s3.model.DeleteObjectResponse;
+import software.amazon.awssdk.services.s3.model.DeleteObjectsRequest;
+import software.amazon.awssdk.services.s3.model.DeleteObjectsResponse;
 import software.amazon.awssdk.services.s3.model.GetObjectRequest;
 import software.amazon.awssdk.services.s3.model.GetObjectResponse;
 import software.amazon.awssdk.services.s3.model.PutObjectRequest;
 import software.amazon.awssdk.services.s3.model.PutObjectResponse;
+import software.amazon.awssdk.services.s3.model.S3Exception;
 import software.amazon.encryption.s3.internal.GetEncryptedObjectPipeline;
 import software.amazon.encryption.s3.internal.PutEncryptedObjectPipeline;
 import software.amazon.encryption.s3.materials.AesKeyring;
@@ -83,6 +88,18 @@ public <T> T getObject(GetObjectRequest getObjectRequest,
         return pipeline.getObject(getObjectRequest, responseTransformer);
     }
 
+    @Override
+    public DeleteObjectResponse deleteObject(DeleteObjectRequest deleteObjectRequest) throws AwsServiceException,
+            SdkClientException {
+        return _wrappedClient.deleteObject(deleteObjectRequest);
+    }
+
+    @Override
+    public DeleteObjectsResponse deleteObjects(DeleteObjectsRequest deleteObjectsRequest) throws AwsServiceException,
+            SdkClientException {
+        return _wrappedClient.deleteObjects(deleteObjectsRequest);
+    }
+
     @Override
     public String serviceName() {
         return _wrappedClient.serviceName();