Kcc fixes

[github at samba.org]

New comment by abartlet on Samba Github repository

https://github.com/samba-team/samba/pull/24#issuecomment-151304816
Comment:
2715805f4c617b9a5d9ae7d2252c6adb30ab6490 and dadfffb51916ab26de51924733b31969173627a7 were merged, leaving only the "python: Extend the samba_kcc --exportldif to include the DC account" patch.  Another approach was used (dumping all of a Samba domain into a test fixture) to cover this aspect.