Fix EUDC LDAP duplicate mail handling

Fix EUDC LDAP duplicate mail handling

Fixes: debbugs:17720
* net/eudcb-ldap.el (eudc-ldap-cleanup-record-simple): Mark as
obsolete.
(eudc-ldap-cleanup-record-filtering-addresses): Add docstring.
Don't clean up postal addresses if ldap-ignore-attribute-codings
is set.  Combine mail addresses into one field. (Bug#17720)
(eudc-ldap-simple-query-internal): Call
eudc-ldap-cleanup-record-filtering-addresses instead of
eudc-ldap-cleanup-record-simple.
(eudc-ldap-get-field-list): Likewise.