html: fix bug introduced by 1aec747c10

Commit 1aec747c10f0d5077842294ca351b918b77fb1e9 failed to address the fix in
789c59e3a27f5d38cabd02c8f57fec605e6146a8 fully. So we somewhat revert
1aec747c10 in stable-2.0.

Yet, as 1aec747c10 is a big performance enhancer, it might be a good idea to
rework on it in devel. But for stable-2.0, the performance hit is acceptable.

Closes: D:689291
graph: remove all extra INFO messages

The start/stop logs are now just plain wrong. Removing them in stable-2.0, as
they are wasting quite a huge diskspace, for almost no value.

And postpone a proper logging scheme for devel.

Closes: #1251
plugins/proc: fix bug in selecting via uid