arbitration of multiple master_sites

[Rainer Müller]

markd at macports.org wrote:
>>> -Sourceforge, gnu, etc., special mirrors go after sorted url list
>> No. They get mixed in with the other master_sites and sorted.
> 
> So if we had this master_sites keyword in port foo:
> 
> master_sites \
>      sourceforge \                 (ping resp t9)
>      ftp://example1.org \    (ping resp t4)
>      http://example2.org \  (ping resp t7)
>      freebsd                           (ping resp t1)

Actually, the mirror lists get expanded first and pinging is then 
started on all hosts regardless if they come from a mirror list or were 
directly given in the Portfile. The only exception is the fallback 
mirror group named "macports", it will always be last.

Rainer