--debug, --is-cast and --is-fanout are defined as args of type=bool.
This means that, for example, if we want to enable debug logging
level, we have to type '--debug True'. But we can also use
'--debug False' in order to do the same, which is very misleading
(in fact, any non-empty string will evaluate to True). This patch
tries to solve this problem by replacing type=bool and
default=False with action='store_true' for these args, so that
we will be able to enable them (they will remain False by default
as before) simply as '--debug' etc.
Change-Id: I8ee04c35427df446966161491da8d264b44975bf
e491573654