Reorder reverse lookup overrides so user-specified ones are effective 2.1

If the user specifies a domain override for 10.in-addr.arpa and also specifies "Do not forward private reverse lookups" then the user-specified entry is not effective. But the code was supposed to allow users to specify individual reverse lookup domain overrides that took precedence.
Re-ordering the placement of the --server entries on the dnsmasq command line fixes this.
Forum: http://forum.pfsense.org/index.php/topic,64986.0.html
Version for 2.1 branch
Merge pull request #750 from phil-davis/RELENG_2_1

Reorder reverse lookup overrides so user-specified ones are effective 2.1