correct watcher project for oslo_config

It should've been "watcher" instead of "python-watcher" as the
config files are expected to be in /etc/watcher/. Though this is
unlikely to cause problems as this patch corrected the default
config dir.

https://review.opendev.org/#/c/658348/

Nevertheless, we should be using the correct name.

Change-Id: If6b58133eecf2fcc37e11d8c45eaa58f238ea2a8

watcher/common/config.py

@@ -28,7 +28,7 @@ def parse_args(argv, default_config_files=None, default_config_dirs=None):
                            cfg.find_config_dirs(project='watcher'))
     rpc.set_defaults(control_exchange='watcher')
     cfg.CONF(argv[1:],
-             project='python-watcher',
+             project='watcher',
              version=version.version_info.release_string(),
              default_config_dirs=default_config_dirs,
              default_config_files=default_config_files)