roles/postgresql-server: Remove postgresql-setup

The *postgresql-setup* service is no longer necessary, as upstream has
fixed the SELinux policy to allow root to invoke the `postgresql-setup`
command directly.

roles/postgresql-server/templates/postgresql-setup.service.j2

@@ -1,11 +0,0 @@
-[Unit]
-Before=postgresql.service
-
-[Service]
-Type=oneshot
-RemainAfterExit=true
-Environment=PGDATA={{ pgdata_dir }}
-Environment=LANG={{ pg_locale }}
-User=postgres
-Group=postgres
-ExecStart=/bin/sh -c "[ -f ${PGDATA}/PG_VERSION ] || initdb -D ${PGDATA}"