Use /. as the directory root to copy from.

[Jamstah]

Description of the change:

Use <container>:/. instead of <container>:/ to copy out of bundles.

Motivation for the change:

A bug in podman makes cp <container>:/ <existing dir> create an additional dir and then opm fails:

[2020-06-13T11:05:56.384Z] time="2020-06-13T11:05:56Z" level=error msg="permissive mode disabled" bundles="[docker.io/ibmcom/ibm-cp-integration-bundle@sha256:2c29f6f774c18c0ac5be178aa1e0a73833ba42bfe7583b9095bb4bcd9890060b]" error="error loading bundle from image: unable to read directory bundle_tmp682869925/metadata: open bundle_tmp682869925/metadata: no such file or directory"

Podman bug is here: containers/podman#6596

Although I consider it a bug in podman (behaviour differs from docker), the docker documentation actually says that by ending the SRC_PATH in . we get the contents of the directory, which is actually what we want:
https://docs.docker.com/engine/reference/commandline/cp/

As such, I think this change introduces more correct behaviour.

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 /docs
• Commit messages sensible and descriptive

[openshift-ci-robot]

Hi @Jamstah. Thanks for your PR.

I'm waiting for a operator-framework 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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[Jamstah]

/assign @dinhxuanvu

[Jamstah]

Can I get ok to test on this one?

[dinhxuanvu]

/ok-to-test

[Jamstah]

Thank you, what are the next steps?

[dinhxuanvu]

@kevinrizza @ecordell PTAL

[kevinrizza]

/approve

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Jamstah, kevinrizza

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[ecordell]

/lgtm

[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.