vacuumlo: add test to vacuumlo for test coverage

When Who What
2023-01-31 01:02:07 vigneshwaran C (vignesh.postgres) Closed in commitfest 2023-01 with status: Returned with feedback
2022-12-08 10:11:10 Ian Barwick (barwick) Closed in commitfest 2022-11 with status: Moved to next CF
2022-09-08 12:53:52 Daniel Gustafsson (d_gustafsson) New status: Waiting on Author
2022-09-08 12:53:48 Daniel Gustafsson (d_gustafsson) Added d_gustafsson as reviewer
2022-09-03 08:30:24 DongWook Lee (dongwooklee) Changed authors to DongWook Lee (dongwooklee)
2022-09-03 08:30:11 DongWook Lee (dongwooklee) Attached mail thread CAAcBya+fQ1RCoPi5UmrrCTbi_tjWs0Xgw0pbmp3bgAAfYjfKyg@mail.gmail.com
2022-09-03 08:30:11 DongWook Lee (dongwooklee) Created patch record