pkg/cli/admin/release: extract to target command not source

[stbenjam]

When extracting commands from a release, the command is typically the
same as the source executable in the image, however if that is not the
case - for example, in the case of the baremetal installer (#57), oc does the
wrong thing. If the command is openshift-baremetal-installer but it
is extracted from usr/bin/openshift-installer, oc extracts the file as
openshift-installer.

[openshift-ci-robot]

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[smarterclayton]

Will try this out, thanks

/assign

[stbenjam]

This is incorporated into #57, as it's become a requirement to make it all work correctly. Can re-open if prefer to review it separately

/close

[openshift-ci-robot]

@stbenjam: Closed this PR.

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In response to this:

This is incorporated into #57, as it's become a requirement to make it all work correctly. Can re-open if prefer to review it separately

/close

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