Revert "[BUGFIX] Reset the logging repository each time a call shuts down to avoid leaking loggers"

This reverts commit 357646fa193b0f431a1ae5298c61f3c8c9efe6ff.

This caused logging to fall over after a while. Needs to be replaced by more selective pruning. Tracked at https://www.pivotaltracker.com/story/show/41683053.