add print about config db update

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac294@2614 e5f2f494-b856-4b98-b285-d166d9295462

src/lib/python/isc/config/cfgmgr.py

@@ -75,6 +75,7 @@ class ConfigManagerData:
                     elif file_config['version'] == 1:
                         # only format change, no other changes necessary
                         file_config['version'] = 2
+                        print("[b10-cfgmgr] Updating configuration database version from 1 to 2")
                         config.data = file_config
                     else:
                         # We can put in a migration path here for old data