aaa: Changing MaxLDAPQueryPartsNumber to long

Changed MaxLDAPQueryPartsNumber to be long to conform to
extensions-api.
In addition added support to Config for Long

Change-Id: I5d001fdb816b4ca7f690ac2578159a75c9f3d058
topic: AAA
Signed-off-by: Yair Zaslavsky <yzaslavs@redhat.com>