[PR PATCH] [Closed]: samba-tool:demote: Remove dns references after demote a DC

[github at samba.org]

There's a closed pull request on the Samba Samba Github repository

samba-tool:demote: Remove dns references after demote a DC
https://github.com/samba-team/samba/pull/193
Description: In `samba-tool domain demote` command, call `remove_dc.remove_dns_references` after demote a DC.
Convert the `test_demote.sh` bash script to a Python unit test file, test demote command, and verify DNS records are removed as expected.