Add logs for plugins data

While loading data form plugin like tests,
config options etc we do not have enough logs
to debug if any plugins is missed.

It is difficult to debug in such cases where we do not
find config options registered by plugins,
For example: https://review.opendev.org/#/c/706785

Adding more logs to know what all data we are loading from
all plugins.

Change-Id: I09d2349a0e32c2265e6beb3dad4619ad33782a51
1 file changed