disable_compression doesn't seem to be working

[mlamothe]

Overview of the Issue

I have two consul servers configured more or less like this (different IP addresses)

`{
"datacenter": "test",
"data_dir": "/opt/consul",
"encrypt": "####",
"client_addr": "10.30.54.161",
"addresses": {
"http": "0.0.0.0"
},
"server": true,
"bootstrap_expect": 2,
"ui": true,
"bind_addr": "10.30.54.161",
"dns_config": {
"disable_compression": true
}

}`

Reproduction Steps

Setup Consul with disable_compression, the response from a SRV DNS query is still compressed.
This actually crashes Go, which doesn't allow compressed SRV records.

Operating system and Environment details

Consul v1.5.2
Ubuntu Server 18.04.02 LTS

[dbknickerbocker]

Go erroneously (golang/go#24870) disables support for compressed SRV Target fields which necessitates the ability to turn off compression in Consul for integrations with any Go related project - i.e. krackend (luraproject/lura#268)