Fixing pulp-dev to create 'catalogers' folder.

When using journalctl to look at the log output as Pulp starts, the celery workers were showing this exception in the logs.  It was due to the pulp-dev.py script not creating this folder correctly.  The file path is truncated because journalctl was showing output in a terminal.

 pulp.plugins.loader.loading:CRITICAL: Cannot load plugins: path does not exist or cannot be read: /usr/l...atalogers