Even if we round down to a multiple of 5, we are still including a large part of the shutdown phase. Remove this.

- Support Nginx
- Measure only a 10-second interval to ensure full load

This gives us better numbers than the hard-coded 15-second delay

This reverts commit 30ca6df2.

currently we have only experiments with turbo boost that needs to be an "additional" tuning

..and support recording specifically the memcached process itself.

Just to make the script cleaner