Stop logging manifest in debug

It's excessively verbose and is a json object which leads to the log
lines not being individual lines. We don't really need to be printing
this anymore.

Change-Id: Ief83030835fa7e8c76ca2607135a4f840782bbb9

tripleo_common/image/image_uploader.py

@@ -1593,8 +1593,6 @@ class PythonImageUploader(BaseImageUploader):
 
         for source_manifest in source_manifests:
             manifest = json.loads(source_manifest)
-            LOG.debug('[%s] Current image manifest: [%s]' %
-                      (image, json.dumps(manifest, indent=4)))
             config_str = None
             if manifest.get('mediaType') == MEDIA_MANIFEST_V2:
                 config_digest = manifest['config']['digest']