cubicweb #2542776 [ldap] deactivated users should be reactivated when they pop again upstream [done]

priorityimportant
typebug
done in3.15.8
load0.500
load left0.000
closed by#2fddbe32ae8b [ldapfeed] if a deactivated user becomes available again in its source, reactivate it (closes #2542776)