samba-tool - MX records cannot be deleted (error in called C-program)

Only matching UNION-members should be compared. MX vs. SRV record

Signed-off-by: Guenter Kukkukk <kukks@samba.org>

Reviewed-by: Andrew Bartlett <abartlet@samba.org>

Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Sun Apr 14 08:46:07 CEST 2013 on sn-devel-104
samba-tool - MX records cannot be deleted (part2)

I missed this one, also a wrong compare of MX vs. SRV record

Signed-off-by: Guenter Kukkukk <kukks@samba.org>

Reviewed-by: Andrew Bartlett <abartlet@samba.org>

Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Sun Apr 14 22:43:07 CEST 2013 on sn-devel-104