Revert "source4/scripting: add an option to samba_dnsupdate to add ns records."

Revert "source4/scripting: add an option to samba_dnsupdate to add ns records."

This reverts a totally unnecessary change to samba_dnsupdate. The self test
environment does the correct things with NS records now.

This reverts commit af08cb2eee9dc9fabad6ca62ca11728209297222.

Signed-off-by: Richard Sharpe <rsharpe@samba.org>
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Mon Jun 27 04:13:04 CEST 2016 on sn-devel-144