DNS prepared query failover: does not translate WAN addresses, SRV returns incorrect datacenter

[maxvt]

Consul version is 0.6.4 for both client and server, running on Ubuntu 14.04.

Description of the Issue (and unexpected/desired result)

When a DNS prepared query fails over to a different datacenter, the result does not translate WAN addresses despite configuration and SRV query returns incorrect datacenter as part of the "hostname".

Reproduction steps

Multiple datacenters with translate WAN enabled. Prepared query that includes a fail over to other datacenters. Service is only available in some datacenters; perform the prepared query using the DNS interface from a datacenter where the service is not available.

A failing test for this scenario and a tentative fix are included in #2219

Log Fragments or Link to gist

-- ~ $ dig my-service.query.consul SRV

; <<>> DiG ---Ubuntu <<>> my-service.query.consul SRV
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: -
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; QUESTION SECTION:
;my-service.query.consul.       IN  SRV

;; ANSWER SECTION:
my-service.query.consul.    0   IN  SRV 1 1 8200 correct-hostname.node.wrong-datacenter.consul.

;; ADDITIONAL SECTION:
correct-hostname.node.wrong-datacenter.consul. 0 IN A   ip-address-local-to-wrong-datacenter

;; Query time: 5 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed Jul 27 22:08:32 UTC 2016

This looks similar to #2218.

[slackpad]

Fixed in #2219 via #2271.