Update GCP marketplace deployer dockerfile

[IronPan]

The previous dockerfile throws me following exception

Traceback (most recent call last):
  File "/bin/set_ownership.py", line 127, in <module>
    main()
  File "/bin/set_ownership.py", line 80, in main
    "Application kind".format(args.manifests))
Exception: Set of resources in /data/manifest-expanded includes more than one of Application kind

Not sure what happens but the new dockerfile works.

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This change is 

[IronPan]

/approve

[k8s-ci-robot]

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[ajchili]

/lgtm

[ajchili]

/lgtm