Avoid namespace conflicts on file rename

Author: Denis Kurochkin

api-sdk/src/test/java/com/smartling/api/sdk/FileApiClientIntegrationTest.java

@@ -132,6 +132,7 @@ private void uploadFile() throws SmartlingApiException
     {
         FileUploadParameterBuilder parameterBuilder = new FileUploadParameterBuilder(JAVA_PROPERTIES, FILE_URI)
                 .charset(CHARSET)
+                .directives(Collections.singletonMap("smartling.namespace", "test-namespace"))
                 .localeIdsToAuthorize(Collections.singletonList("es"))
                 .overwriteAuthorizedLocales(true);
         fileApiClient.uploadFile(fileToUpload, parameterBuilder);