Revert the custom cobra vendor

[Luap99]

Vendor in the latest cobra release v1.1.1

This will hurt the completion experience but is required for
proper packaging, see: #8528.

The best solution is to keep the current scripts since they
work fine with cobra v1.1.1.

[vrothberg]

I suggest to wait before merging. Reverting would be sad. Your work is fantastic and I am optimistic we can keep it.

I dropped a comment in spf13/cobra#1258 to pull in Eric who can help us speed things up upstream. Vendoring a non-release commit is already a huge improvement over vendoring a fork.

[vrothberg]

I like this approach. We keep the great bash completions but use the upstream cobra!

LGTM

[Luap99]

The best thing is to keep the current scripts, they work fine with cobra v1.1.1

One problem with that is that podman completion will not generate the best possible scripts. However this is fine since we store the best scripts in ./completions/ and these are used for packaging. I don't think many users want to use this command anyway.
And we would also add one small bug: spf13/cobra#1258

[umohnani8]

LGTM
@baude @rhatdan @mheon PTAL

[rhatdan]

/lgtm
/approve
/hold

[openshift-ci-robot]

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[rhatdan]

/hold cancel