Add plugins/mitogen to .gitignore

[miff2000]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake
/kind cleanup

What this PR does / why we need it:

If the included mitogen.yml playbook is run, it installs Mitogen in plugins/mitogen, causing Git to believe there to 500+ changes. This simply excludes that external module from git.

Which issue(s) this PR fixes:

Special notes for your reviewer:
None

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @miff2000. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[miff2000]

/check-cla

[floryut]

/ok-to-test
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, miff2000

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[miff2000]

/test packet_debian9-calico-upgrade

[k8s-ci-robot]

@miff2000: The specified target(s) for /test were not found.
The following commands are available to trigger jobs:

• /test pull-kubespray-yamllint

Use /test all to run all jobs.

In response to this:

/test packet_debian9-calico-upgrade

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[oomichi]

/lgtm