[Bug 752461] validate: add skip_default paths

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752461

--- Comment #3 from Vineeth <vineeth.tm at samsung.com> ---
Even i wanted to do like that only..
when medias-paths is being set self.paths is being populated..
so probably in add_path, we can check if self.paths is already available and
return..

But i was a little skeptical if this is proper, so i thought of adding a new
property..
you think checking self.paths and returning is ok?

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