Add After=postgresql.service to all pulpcore services
#395
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Before/After ensure ordering when starting and stopping services [1], thus ensuring that pulpcore services are started after PostgreSQL and stopped before.
Especially the stopping part is important, as otherwise pulpcore workers fail to update their state in the DB, leading to odd upgrade issues where it seems like old workers are still active (as they exist in the DB).
[1] https://www.freedesktop.org/software/systemd/man/latest/systemd.unit.html#After=