Propagate the favicon information to getInfo() for local repos

This is needed by MultimediaViewer to show a relevant icon next
to the local and foreign db repo link in the description area

The setting ends up in configuration for foreign DB, because the
favicon value is stored in the configuration of a wiki, not in its
database.

Change-Id: I3d0599c1afa13e1d8540ff3c8bc34129a55792c5
Merge "Propagate the favicon information to getInfo() for local repos"