put mutex around installplan creation

[akihikokuroda]

Signed-off-by: akihikokuroda akihikokuroda2020@gmail.com

Description of the change:
This PR makes the check if the InstallPlan has to be created and the creation of the installplan in a locked block so that 2 namespace queue workers don't create the Installplan for the subscription.

Motivation for the change:

Closes #2544

Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Docs updated or added to /doc
• Commit messages sensible and descriptive

[openshift-ci]

Hi @akihikokuroda. Thanks for your PR.

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[perdasilva]

lgtm - it could be worth while to add some comments to explain why the lock is needed, maybe even reference the issue. Might help other people keep an eye on these types of race conditions, etc.

[perdasilva]

/lgtm

[akihikokuroda]

The e2e test failure is addressed in #2542.

[perdasilva]

@akihikokuroda could you please rebase

[perdasilva]

/lgtm

[perdasilva]

/ok-to-test

[timflannagan]

/lgtm

[awgreene]

/approve

[akihikokuroda]

/retest

[timflannagan]

@akihikokuroda Can you rebase this when you get a chance? I think this is ready to go.

[timflannagan]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: akihikokuroda, awgreene, timflannagan

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