[ldap auth] make sure imported passwords from LDAP are encrypted (closes #2583994)
When a user is imported from an LDAP source (in ldapfeed or when converting a
user from an ldapsource to system one), we may import a clear-text password,
which we do not want to do in our system database.
dn: dc=cubicweb,dc=test
structuralObjectClass: organization
objectClass: dcObject
objectClass: organization
o: cubicweb
dc: cubicweb
dn: ou=People,dc=cubicweb,dc=test
objectClass: organizationalUnit
ou: People
structuralObjectClass: organizationalUnit
dn: uid=syt,ou=People,dc=cubicweb,dc=test
loginShell: /bin/bash
objectClass: inetOrgPerson
objectClass: posixAccount
objectClass: top
objectClass: shadowAccount
structuralObjectClass: inetOrgPerson
cn: Sylvain Thenault
sn: Thenault
shadowMax: 99999
gidNumber: 1004
uid: syt
homeDirectory: /home/syt
shadowFlag: 134538764
uidNumber: 1004
givenName: Sylvain
telephoneNumber: 106
displayName: sthenault
gecos: Sylvain Thenault
mail: sylvain.thenault@logilab.fr
mail: syt@logilab.fr
userPassword: syt
dn: uid=adim,ou=People,dc=cubicweb,dc=test
loginShell: /bin/bash
objectClass: inetOrgPerson
objectClass: posixAccount
objectClass: top
objectClass: shadowAccount
cn: Adrien Di Mascio
sn: Di Mascio
shadowMax: 99999
gidNumber: 1006
uid: adim
homeDirectory: /home/adim
uidNumber: 1006
structuralObjectClass: inetOrgPerson
givenName: Adrien
telephoneNumber: 109
displayName: adimascio
gecos: Adrien Di Mascio
mail: adim@logilab.fr
mail: adrien.dimascio@logilab.fr
userPassword: adim