Moved a blob related logging message to debug level, for the case of...

Moved a blob related logging message to debug level, for the case of everything working as intended.

src/CHANGES.txt

@@ -22,6 +22,9 @@ New Features
   XXX There are known issues with this implementation that need to be
   sorted out before it is "released".
 
+- Moved a blob related logging message to debug level, for the case of
+  everything working as intended.
+
 - Changed the url in the package metadata to point to PyPi. Also removed
   references to download.zope.org.
 

src/ZODB/blob.py

@@ -518,7 +518,7 @@ def auto_layout_select(path):
         layout = open(layout_marker, 'rb').read()
         layout = layout.strip()
         log('Blob directory `%s` has layout marker set. '
-            'Selected `%s` layout. ' % (path, layout))
+            'Selected `%s` layout. ' % (path, layout), level=logging.DEBUG)
     return layout