User LDAP populate does not work with Active Directory

[Daniel Reis]

With Active Direcory, the LDAP filter is "sAMAccountName=%".
However, in the code this key is changed to lowercase, "samaccountname", so the lookup on the LDAP result disct can't match the "sAMAccountName" entry.
I got it fixed by removing the ".lower()" at model/users_ldap.pt#55.

Traceback:
  File "/opt/openerp/therp61/main/therp-addons/users_ldap_populate/model/users_ldap.py", line 83, in populate_wizard
    cr, uid, {'ldap_id': ids[0]}, context=context)
  File "/opt/openerp/therp61/main/therp-addons/users_ldap_populate/model/populate_wizard.py", line 40, in create
    cr, uid, vals['ldap_id'], context=context)
  File "/opt/openerp/therp61/main/therp-addons/users_ldap_populate/model/users_ldap.py", line 64, in action_populate
    cr, uid, conf, result[1][login_attr][0], result)
KeyError: u'samaccountname'

Debug:
-> cr, uid, conf, result[1][login_attr][0], result)
(Pdb) p login_attr
u'samaccountname'
(Pdb) p result[1]['samaccountname'][0]
*** KeyError: KeyError('samaccountname',)
(Pdb) p result[1]['sAMAccountName'][0]
'abelps'