Changes

pySim-shell: use log level INFO by default

The default log level of the PySimLogger is DEBUG by default. This is
to ensure that all messages are printed in an unconfigured setup.

However in pySim-Shell we care about configuring the logger, so let's
set the debug log level to INFO in startup. This will allow us to
turn debug messages on and off using the verbose switch.

Change-Id: I89315f830ce1cc2d573887de4f4cf4e19d17543b
Related: SYS#7725