Repositories are identified with a 'url' in the
remote 'repo.info' file. There is also a
'base url' which is the URL locally with which
the system is able to access the repository
data on. There is some confusion between these
two terms in the source. This change aims to
separate the two out and consistently name them.
The settings for the repository locally also was
not storing these values and that has been fixed.
Debug info about the repositories also did not
display the two urls consistently and will now
also do so. Finally, HaikuDepot now correlates
locally configured repositories with the data in
HaikuDepotServer using the identifier URL; this
makes the use of mirrors with HaikuDepot possible.
Fixes#13888
Change-Id: I66dfe589b05c24e1ab123a6945352e0f24b60bf1