Remove restart.sh and start.sh in docker file

[jichenjc]

What this PR does / why we need it:

time to time, my env stuck at download this restart.sh and start.sh those files are used for Tilt and not needed at capi 0.4.0 ,so remove them

further info can refer https://github.com/kubernetes-sigs/cluster-api-provider-openstack/pull/761

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 #

[jichenjc]

some error I had:

=> CACHED [builder 5/11] RUN --mount=type=cache,target=/root/.local/share/golang --mount=type=cache,target=/go/pkg/mod go mod download 0.0s => CACHED [builder 6/11] COPY main.go main.go 0.0s => [builder 7/11] COPY api/ api/ 1.0s => [builder 8/11] COPY controllers/ controllers/ 1.5s => [builder 9/11] COPY controlplane/ controlplane/ 1.7s => [builder 10/11] RUN wget --output-document /restart.sh --quiet https://raw.githubusercontent.com/windmilleng/rerun-process-wrapper/master/restart.sh && wget --output-document 84.5s ^CERRO[0098] got 3 SIGTERM/SIGINTs, forcing shutdown

[gyliu513]

/lgtm

[christopherhein]

/lgtm /approve

I personally am not using tilt for dev, if anyone is they can setup a local dockerfile instead. thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: christopherhein, jichenjc

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