samba_dnsupdate changes for better RODC support

[Michael Brown]

While attempting to get samba4 RODC functionality working I encountered 
a few problems with DNS entries not being added. This patch helps 
alleviate them.

Most of the changes are a result of seeing how Windows 2008R2 behaves in 
the same setup and duplicating that. For example, these two DNS records:

SRV _ldap._tcp.${SITE}._sites.DomainDnsZones.${DNSDOMAIN} ${HOSTNAME} 389
SRV _ldap._tcp.${SITE}._sites.ForestDnsZones.${DNSFOREST} ${HOSTNAME} 389

Unfortunately samba won't *actually* add them yet:
Unable to map to netlogon DNS update: SRV 
_ldap._tcp.shire._sites.domaindnszones.main.adlab.netdirect.ca 
sles-shire.main.adlab.netdirect.ca 389
Unable to map to netlogon DNS update: SRV 
_ldap._tcp.shire._sites.forestdnszones.main.adlab.netdirect.ca 
sles-shire.main.adlab.netdirect.ca 389

This has *not* been tested in a full DC scenario, I've been focusing on 
RODC.

M.

-- 
Michael Brown               | `One of the main causes of the fall of
Systems Consultant          | the Roman Empire was that, lacking zero,
Net Direct Inc.             | they had no way to indicate successful
☎: +1 519 883 1172 x5106    | termination of their C programs.' - Firth

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