Use log_ family instead of VERBn log calls


Mapping:
      log = log_warning
VERB1 log = log_notice
VERB2 log = log_info
VERB3 log = log_debug
VERBn (p)error = (p)warn_msg

Related to rhbz#1001139.

Signed-off-by: Richard Marko <rmarko@redhat.com>