cli: set all the log level of all known loggers with -v and -d

cli: set all the log level of all known loggers with -v and -d

Set log levels according to --debug or --verbose. For
backward compatibility, --debug is more verbose than
--verbose. So:

    --verbose: INFO log level
    --debug:   VERBOSE log level (includes DEBUG, which is
               is less verbose than VERBOSE in the internal
               logging framework)

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>