[application/connect] simplify connection logic ``application.connect`` now either sets a full featured ``DBAPISession`` to the ``WebRequest`` object or raises ``AuthenticationError``. The creation and usage of a fake DBAPISession is now handled by ``main_handle_request`` when needed. This means that fake DBAPISession are no longer tracked by the session manager and that user are not given anyway to retrieve them for a later request. This fake DBAPISession is still passed to ``core_handle`` because multiple cubes like registration or forgotten password need this behavior. We would like to get ride of it in the future. This clarification of the connection API greatly simplifies ``DBAPISession`` retrieval//creation process opening the way to improvements in this area. Related to #2503918

from cubicweb import UnknownEid
source, = __args__

sql("DELETE FROM entities WHERE type='Int'")

ecnx = session.cnxset.connection(source)
for e in rql('Any X WHERE X cw_source S, S name %(name)s', {'name': source}).entities():
    meta = e.cw_metainformation()
    assert meta['source']['uri'] == source
    try:
        suri = ecnx.describe(meta['extid'])[1]
    except UnknownEid:
        print 'cant describe', e.cw_etype, e.eid, meta
        continue
    if suri != 'system':
        try:
            print 'deleting', e.cw_etype, e.eid, suri, e.dc_title().encode('utf8')
            repo.delete_info(session, e, suri, scleanup=e.eid)
        except UnknownEid:
            print '  cant delete', e.cw_etype, e.eid, meta


commit()