DC/OS Spartan unable to resolve DNS under high traffic

Description

When the request rate is high, DNS resolution is giving out.

```
time="Nov 23 01:32:55" level=error msg="request error: Upstream host lookup failed" api_id=d6f4f7517977441b5349759b4d26b4a9 org_id=578daa8efce9d6000100000b path="/1/classes/Love" server_name="https://api.parse.com/1" user_id= user_ip="113.210.200.208, 10.0.3.57, 10.0.3.57"
```

I'm getting like 100 such request failures in 1 minute.

Assignee

Sargun Dhillon

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