Add support to Source mirroring

[Otavio Salvador]

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Hello folks,

Today I received a mail asking to include support to mirror source of
packages too. I this we can deal with it like:

Add, on configuration file, an option get_sources and by default, when
this is set, got all sources of package we are getting in backend.

And on backend, allow to the source_only option so we can use it to
get only the source against one filter ;-)

What all think about it?

-- 
        O T A V I O    S A L V A D O R
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