capi: i can do better benchmarking w/o stdout

Change-Id: I68ef5298a9f52a5fbb2392ded108ab172b3ebe22
[http] HttpWorker: posting execution blocks into the worker doesn't depend on libev's ev_once() anymore

This is because I seem to have ton of libev corrupt-timer bugs related to this.
Not using libev for post()ing seems to fix it. Oh wonder?

Change-Id: I54e2831f108e9f9d967cf791c7d29d5d59d02f0b
cleanup

Change-Id: Idd9c7857a89cb4f611d5295f83137fe9b4e3632d