Doing this setup on import is simple, but it has issues if the pungi
code is directly imported into a different process.
Specifically, ODCS may have created its own provider and set things up
as needed, and then imports pungi, which tries to set a new provider.
This is prohibited by the SDK docs, and emits a warning. In reality it
is causing spans to be attributed to a wrong service.
As a side effect, RequestsIntrumentor doesn't start, and so the parent
process will need to do that on its own instead of relying on the side
effect.
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
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