Move the responsibility for stdout to the CLI module

Change-Id: I5970fb02834b026b9e7898da7addff170b50bed1

keystone/cmd/cli.py

@@ -464,7 +464,7 @@ class DbVersion(BaseApp):
     @staticmethod
     def main():
         assert_not_extension(CONF.command.extension)
-        migration_helpers.print_db_version()
+        print(migration_helpers.get_db_version())
 
 
 class BasePermissionsSetup(BaseApp):

keystone/common/sql/migration_helpers.py

@@ -221,10 +221,6 @@ def get_db_version():
                                     get_init_version())
 
 
-def print_db_version():
-    print(get_db_version())
-
-
 def expand_schema():
     """Expand the database schema ahead of data migration.