Get gke-self-managed.sh working on macOS

[yfuruyama]

As using sed for appending a line doesn't work on macOS, changed to use awk.

# on macOS
$ sed "/name: http/a \ \ \ \ nodePort: ${NODE_PORT}" ../resources/default-http-backend.yaml
sed: 1: "/name: http/a \ \ \ \ n ...": extra characters after \ at the end of a command

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[yfuruyama]

I signed it

[yfuruyama]

I signed it

[yfuruyama]

/assign @freehan

[rramkumar1]

/ok-to-test

[rramkumar1]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rramkumar1, yfuruyama

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