canopen: Verbosity for INFO column

Display basic information about what is going on in the INFO column to
ease protocol debugging.

Change-Id: I2a3aba8008bf65ab9e236a3d81335cf723b2edd0
Reviewed-on: https://code.wireshark.org/review/5521
Petri-Dish: Michael Mann <mmann78@netscape.net>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>