cubicweb #3824889 impossible to remove key from user-attrs-map argument in LDAPSource [validation pending]

when providing user-attrs-map as an argument, the new key values are used to update the default dictionary. If a key is not provided, the default is used. It is therefore impossible to delete a key available in the default parameters. Many keys are provided by default which make this an issue

done in3.20.0
load left0.000
closed by#340d4ef55b6f [ldapfeed] Reduce default value for user-attrs-map option (closes #3824889)
patch[ldapfeed] Reduce default value for 'user-attrs-map' option (closes #3824889) [rejected]