65c89cc Add method to read changes from LDIF

Authored and Committed by mbasti 8 years ago
    Add method to read changes from LDIF
    modifications_from_ldif will read LDIF file and changes in LDIF will
    be cached until parse() is called. After calling parse() method changes
    will be applied into destination LDIF.
    Only changetype modify is supported, the default operation is add.
    Also fixes:
    Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>