Hardening/failing func tests under valgrind

### Description
Improvements for valgrind test suite.
Including directory of each test (except pure valgrind tests) in test output and the lines are longer (120 chars).
Introduced a number of sleeps in functional tests to try to fix the failures under valgrind (the sleeps are executed only if the tests run under valgrind).


uptime is sometimes 10 seconds.
9 -> 10: one byte more in output.
And this we have in two places.
Actually Content-Length is either 220 or 222 (I think it was).
22x I believe is good enough. This is not what I wanted to check with this addition, but that the statistics for the requests are actually counted for.