add test for manager.

[morvencao]

No description provided.

[morvencao]

@sdake @geeknoid I have added test for the controller and manager which needs kubebuilder binaries to get started, would you help to add kubebuilder binaries to the build-tools image.

The test is import because it can prevent the API changes that breaks the controller.

In my local env, I'm using kubebuilder v1.0.8 and everything is OK:

root@mcdev1:~/go/src/istio.io/operator# kubebuilder version
Version: version.Version{KubeBuilderVersion:"1.0.8", KubernetesVendor:"1.13.1", GitCommit:"1adf50ed107f5042d7472ba5ab50d5e1d357169d", BuildDate:"2019-01-25T23:14:29Z", GoOs:"unknown", GoArch:"unknown"}

[elfinhe]

/retest

[istio-testing]

@morvencao: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
test_operator	ad7d152	link	/test test_operator

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[elfinhe]

LGTM, @sdake @howardjohn please consider adding kubebuilder into build-tools.

[istio-testing]

@morvencao: PR needs rebase.

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