[predicates] keep making `yes` predicate importable from cubicweb (closes #2790319)
The `yes` predicate was moved out in CubicWeb 3.15 but it should have
remained importable from the cubicweb.predicates module, for bw compat
reasons and also because logilab.common.registry is an implementation
detail.
# some entities have been added before schema entities, fix the 'is' and
# 'is_instance_of' relations
for rtype in ('is', 'is_instance_of'):
sql('INSERT INTO %s_relation '
'SELECT X.eid, ET.cw_eid FROM entities as X, cw_CWEType as ET '
'WHERE X.type=ET.cw_name AND NOT EXISTS('
' SELECT 1 from is_relation '
' WHERE eid_from=X.eid AND eid_to=ET.cw_eid)' % rtype)