papi: use the injected logger wherever possible

papi: use the injected logger wherever possible

As the injected logger is already expected
to be used everywhere, this is a fix.

The few lines in vpp_serializer.py are not fixed,
but they are not encountered in CSIT testing.

Functions call_logger and return_logger
have single call site each (and confusing names, as they do not log),
so saved few lines by inlining them.

Type: fix

Change-Id: I7dd1e610ef6b885943708bf78bddedfbcf4daa1a
Signed-off-by: Vratko Polak <vrpolak@cisco.com>