Replace funcname prefix convention on every log messages by appropriate logging formater

I propose to use funcName in our logging formatter and remove all hardwritten references on log.*("mymethodename(): blahblihblue")

e.g:

format = %(asctime)s %(levelname)-5.5s [%(threadName)s][%(name)s:%(lineno)s] %(funcName)s(): %(message)s

This refactoring would make code maintenance much easier.

This could be done after feature branch dedicated to try spica-injest.