Remove local Vagrant workflow from CONTRIBUTING.adoc
Remove local Vagrant workflow from CONTRIBUTING.adoc

The local virtual machine workflow using the Vagrant plugin is not
supported any longer as the plugin is entering end-of-life. When local
virtual machine images are published regularly for the origin-ci-tool,
this document can be updated to reflect those workflows. In the mean-
while, though, this section should be removed as it's only going to
cause confusion.

Signed-off-by: Steve Kuznetsov <a7da0fca91d9933d2725d731a48cabdc9e8ffd7a@redhat.com>

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