Changes

docs/osmo-smdpp: restructure subsection "osmo-smdpp"

Sphinx is complaining about a duplicate label "osmo-smdpp". Apparantly
because we use this label twices as section headline. The subsection
"osmo-smdpp" in "Running osmo-smdpp" talks about the commandline and the
supplementary files that osmo-smdpp needs to run. Let's split the two
topics into two different sections.

Change-Id: I8bc4979160a00d36a03b9cd10679562a08c2c55c