CLUSTER-API-205: Initialize the 'flag' library to remove error message from glog

[spew]

What this PR does / why we need it:
Prior to this change, every line of logging had the following error message prefixing the actual log:

ERROR: logging before flag.Parse

This is because glog has a hard dependency on the flag package. This 'hack' serves to make glog happy.

Which issue(s) this PR fixes:
Fixes # #205

Special notes for your reviewer:
Tested by running a developer gce-machine-controller image. Below is the before & after for this change.

Before:

ERROR: logging before flag.Parse: I0523 21:53:41.081142       1 queue.go:38] Start Machine Queue
ERROR: logging before flag.Parse: I0523 21:53:41.081442       1 queue.go:38] Start NodeWatcher Queue
ERROR: logging before flag.Parse: E0523 21:53:41.386480       1 reflector.go:205] sigs.k8s.io/cluster-api/pkg/controller/sharedinformers/zz_generated.api.register.go:56: Failed to list *v1alpha1.MachineDeployment: the server could not find the requested resource (get machinedeployments.cluster.k8s.io)
E

After:

I0523 21:56:26.012299       1 queue.go:38] Start Machine Queue
I0523 21:56:26.017385       1 queue.go:38] Start NodeWatcher Queue
E0523 21:56:26.388359       1 reflector.go:205] sigs.k8s.io/cluster-api/pkg/controller/sharedinformers/zz_generated.api.register.go:55: Failed to list *v1alpha1.Machine: the server could not find the requested resource (get machines.cluster.k8s.io)
E

Release note:

NONE

@kubernetes/kube-deploy-reviewers

[k8s-ci-robot]

Hi @spew. Thanks for your PR.

I'm waiting for a kubernetes or kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[spew]

/assign @jessicaochen @mkjelland @kcoronado

[spew]

/assign @justinsb

[spew]

/ok-to-test

[mkjelland]

/lgtm

[spew]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: spew

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