Fix fmt strings

[alvaroaleman]

What this PR does / why we need it:

Without this patch, make fails on go 1.11 with a

# sigs.k8s.io/cluster-api/cmd/clusterctl/clusterdeployer/clusterclient
cmd/clusterctl/clusterdeployer/clusterclient/clusterclient.go:592: Warningf format %v reads arg #2, but call has 1 arg
# sigs.k8s.io/cluster-api/cmd/clusterctl/clusterdeployer
cmd/clusterctl/clusterdeployer/clusterdeployer_test.go:814: T.Fatalf format %q has arg tc.inputMachines of wrong type []*sigs.k8s.io/cluster-api/pkg/apis/cluster/v1alpha1.Machine
cmd/clusterctl/clusterdeployer/clusterdeployer_test.go:818: T.Fatalf format %q has arg tc.inputMachines of wrong type []*sigs.k8s.io/cluster-api/pkg/apis/cluster/v1alpha1.Machine
cmd/clusterctl/clusterdeployer/clusterdeployer_test.go:823: T.Fatalf format %q has arg tc.inputMachines of wrong type []*sigs.k8s.io/cluster-api/pkg/apis/cluster/v1alpha1.Machine
cmd/clusterctl/clusterdeployer/clusterdeployer_test.go:827: T.Fatalf format %q has arg tc.inputMachines of wrong type []*sigs.k8s.io/cluster-api/pkg/apis/cluster/v1alpha1.Machine

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

NONE

[alvaroaleman]

/assign @roberthbailey

[alvaroaleman]

cc @xmudrii

[xmudrii]

/ok-to-test

[alvaroaleman]

/test pull-cluster-api-test

[alvaroaleman]

/retest

All the failed tests have a timeout waiting for process kube-apiserver to start on top of them, maybe that timeout is too low?

[roberthbailey]

@pwittrock ^^

[roberthbailey]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, roberthbailey

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