Revert "Add tracing to logging framework"

The tracing API still misses some real-world exposure. Let's
re-do this in dev to have more time.

This reverts parts of following commits:

466e0dff4bb686e51d0ab3f905631fcb7dd8bfef
7a47aebe9ed41d6cd9c9bcd45758d4d553668e99
a652bab6a7ebf78b029fea95c2801deb6f4f524a
8f0654ceb878b6c8a08c7f5b790027c26e007c13
4162522edd9d31bd2798ab37f083adff818d886e
32f27b4367c4e042a3f0cda671579494e31c1d69
9ff81bdc1ab4e3d14914192cd63ae625a507fe90

Change-Id: If97340c37b8b3363f597683336a8390d5ff386f1
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>