vendir completion outputs superflous "Succeeded"

[scop]

What steps did you take:
[A clear and concise description steps that can be used to reproduce the problem.]

vendir completion bash outputs trailing "Succeeded" line, causing an error when sourced.

What happened:
[A small description of the issue]

vendir completion bash | tail -n 1

What did you expect:
[A description of what was expected]

No trailing "Succeeded" line.

Anything else you would like to add:
[Additional information that will assist in solving the issue.]

Environment:

• vendir version (execute vendir --version):
• OS (e.g. from /etc/os-release):

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[praveenrewar]

At some point we made this change in kapp, it seems like we should have made it in vendir as well.
@scop Would you like to contribute a PR with the fix?