scripts/oe-debuginfod: correct several issues

Particularly:
- nesting subprocess.run() inside subprocess.check_output() does not work at all.
How was this tested?
- -R and -U options can be combined; no need to separate the invocations based
on packaging format
- both exception handlers are unnecessary; we can simply print the hint if
invocation did not succeed
- to run debuginfod from its own sysroot, '-c addto_recipe_sysroot' for elfutils-native
must be executed

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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