Refactoring of pkg/log and fix for calldepth

All logging was from pkg/log/log.go file before.

But I think that all this log stuff becoming ridiculous. We're trying to write one billion first logging framework for go and we actually have no enough time for this.
I vote for using just log from std or vendoring some popular logging framework. 
It was in Fatal function, I can return it back. But it seems working in some utils_test.