config: `0.0.0.0` should not be used as an URL
config: `0.0.0.0` should not be used as an URL

* Replaces `0.0.0.0` with better defaults. (closes #3052)

Signed-off-by: Marco Neumann <3829486b93ec44395f0b980424bae9b6fb07b7bc@crepererum.net>
Reviewed-by: Jiri Kuncar <2bdffcb416fed3002465740d19a053a39918cbe5@cern.ch>

inveniosoftware/invenio,tiborsimko/invenio,inveniosoftware/invenio,tiborsimko/invenio