Add openssh-lpk schema

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Add functon add_entry, delete_entry for testing

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
test of search, add, delete of ldap

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>