tools: Remove debug log when parsing args in engine-config

Removes debug log messages when parsing args in engine-config. This is
needed to enable logging setup that uses command line arguments.

Change-Id: I3b549b8216c3e1af2cf167fac978673c9528894d
Bug-Url: https://bugzilla.redhat.com/1063901
Signed-off-by: Martin Perina <mperina@redhat.com>