This is safe to merge during freeze as this is an osquery-perf only
change.
```
panic: runtime error: index out of range [1] with length 1
goroutine 14 [running]:
main.(*agent).config(0xc0001e5b80)
/Users/luk/fleetdm/git/fleet/cmd/osquery-perf/agent.go:847 +0xb74
main.(*agent).runLoop(0xc0001e5b80, 0x0?, 0x0?)
/Users/luk/fleetdm/git/fleet/cmd/osquery-perf/agent.go:463 +0x4d2
created by main.main in goroutine 1
/Users/luk/fleetdm/git/fleet/cmd/osquery-perf/agent.go:1666 +0x1285
```
Lucas Manuel Rodriguez
8c6cefc4f4