[multi-sources-removal] Drop deleted_entities system table and entities.mtime column since they were only used by the entities_modified_since api of the repository which has been dropped. Along with them, the multi-sources-etypes configuration variable and some sql queries at modification/deletion time of entities. Bon vent ! Related to #2919300

sync_schema_props_perms('EmailAddress')

for source in rql('CWSource X WHERE X type "ldapuser"').entities():
    config = source.dictconfig
    host = config.pop('host', u'ldap')
    protocol = config.pop('protocol', u'ldap')
    source.cw_set(url=u'%s://%s' % (protocol, host))
    source.update_config(skip_unknown=True, **config)

commit()