Commit
971988d673a02d1d816ebcdcb9b4d729230ef03d
by Oliver Smithcontrib/systemd: use StateDirectory
Adjust the systemd service to be more similar to other Osmocom
projects, by using StateDirectory. This directory gets created by
systemd, so remove the ExecStartPre=/usr/bin/mkdir line.
Related: https://www.freedesktop.org/software/systemd/man/latest/systemd.exec.html
Change-Id: I83c7749ca1277b71e25c41b4dc943e83608bd442