Create marker files for use by "invoke-run"

Create marker file in /usr/share, that is checked by "invoke-run".  If
marker file is absent, package was unstalled, but not purged (runscripts
are conffiles), and service must be put into "down" state.

To not break already-existing runscript, using "invoke-run", such check
is only performed when it is known, that marker file existed. It can be
known by checking presence of /etc/sv/{name}/.meta/installed.

Gbp-Closes: #929693

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