Add missing ws seperator between words part 2

This is to add missing ws seperator between words

Change-Id: I83b74ccde5dfc7e74f55a4df6fa1ad67442042a4
diff --git a/tempest/api/image/v2/test_images.py b/tempest/api/image/v2/test_images.py
index aa57daf..c938cee 100644
--- a/tempest/api/image/v2/test_images.py
+++ b/tempest/api/image/v2/test_images.py
@@ -185,7 +185,7 @@
                      for disk_fmt in disk_fmts]
 
         for (container_fmt, disk_fmt) in all_pairs[:6]:
-            LOG.debug("Creating an image"
+            LOG.debug("Creating an image "
                       "(Container format: %s, Disk format: %s).",
                       container_fmt, disk_fmt)
             cls._create_standard_image(container_fmt, disk_fmt)