Follow up on #774

[freehan]

Addressing #774 (comment)

Unit test coverage up a little bit #774 (comment)

$ go test -coverprofile=coverage.out ./...
ok  	k8s.io/ingress-gce/pkg/neg	2.463s	coverage: 64.1% of statements
?   	k8s.io/ingress-gce/pkg/neg/metrics	[no test files]
ok  	k8s.io/ingress-gce/pkg/neg/readiness	0.315s	coverage: 73.0% of statements
ok  	k8s.io/ingress-gce/pkg/neg/syncers	2.316s	coverage: 72.2% of statements
ok  	k8s.io/ingress-gce/pkg/neg/types	0.423s	coverage: 28.0% of statements
?   	k8s.io/ingress-gce/pkg/neg/types/shared	[no test files]

[rramkumar1]

/assign @bowei

[bowei]

/lgtm
/approve

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