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* Add swagger support and documentation
* Promote handler as there can only ever be one
* Update swagger tags
Between verbs and paths there are four endpoints for /_ping. I've
attempted to document them well without four copies of the details.
Time will tell.
Clients will use the headers `Libpod-API-Version` and
`Libpod-Buildha-Version` to determine if they are connecting to a Podman
service or some other compatible engine.
Client calls GET(/_ping):
* VARLINK engines will fail with error message
* Compatible engines will return 200 without Libpod headers
* Podman engines will return 200 and Libpod headers
Signed-off-by: Jhon Honce <jhonce@redhat.com>
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