cubicweb-securityprofile #2605082 couple profile update to ldapfeed update [validation pending]

this will avoid situations where users in the LDAP are still unknown from the instance but security profile tries to do things with them (it assumes they are already there)

prioritynormal
typebug
done in0.2.1
load0.200
load left0.000
closed by#d2fe420d91ce hooks: synchronize updates with the ldapfeed updates to avoid bad surprises (closes #2605082)