Fix port conflict issue for All-in-One loggregator & traffic_controller

test result

```
Testing trafficcontroller/trafficcontroller
=== RUN TestOutgoingProxyConfigWithEmptyAZ
--- PASS: TestOutgoingProxyConfigWithEmptyAZ (0.00 seconds)
=== RUN TestOutgoingProxyConfigWithTwoAZs
--- PASS: TestOutgoingProxyConfigWithTwoAZs (0.00 seconds)
=== RUN TestConfigWithEmptyLoggregatorIncomingPort
--- PASS: TestConfigWithEmptyLoggregatorIncomingPort (0.00 seconds)
=== RUN TestConfigWithLoggregatorIncomingPort
--- PASS: TestConfigWithLoggregatorIncomingPort (0.00 seconds)
=== RUN TestConfigWithEmptyLoggregatorOutgoingPort
--- PASS: TestConfigWithEmptyLoggregatorOutgoingPort (0.00 seconds)
=== RUN TestConfigWithLoggregatorOutgoingPort
--- PASS: TestConfigWithLoggregatorOutgoingPort (0.00 seconds)
PASS
ok trafficcontroller/trafficcontroller 1.012s

Vetting trafficcontroller/trafficcontroller
Package trafficcontroller/trafficcontroller PASSED

SUITE SUCCESS
```