Introduce wait_for_subscription_sync for TAP tests

When Who What
2022-09-09 00:51:31 Masahiko Sawada (masahikosawada) Closed in commitfest 2022-09 with status: Committed
2022-09-09 00:51:31 Masahiko Sawada (masahikosawada) Changed committer to amitkapila
2022-08-04 09:19:46 Daniel Gustafsson (d_gustafsson) Changed topic to Testing
2022-08-01 20:58:21 Jacob Champion (jchampion) Closed in commitfest 2022-07 with status: Moved to next CF
2022-07-26 01:39:04 Masahiko Sawada (masahikosawada) Changed authors to Masahiko Sawada (masahikosawada)
2022-07-26 01:38:58 Masahiko Sawada (masahikosawada) Attached mail thread CAD21AoC-fvAkaKHa4t1urupwL8xbAcWRePeETvshvy80f6WV1A@mail.gmail.com
2022-07-26 01:38:58 Masahiko Sawada (masahikosawada) Created patch record