Tests

Fix: AIX/Solaris use python3.8 in UT #1194

Job	Run time
Build [macosx_arm64]	9m 7s
Build deps [ubuntu]	4s
Documentation	44s
Build [docker]	17m 56s
Shellcheck	8s
Build [ubuntu]	15m 49s
Build Prometheus plugin [ubuntu]	9m 28s
UT [python]	12s
IT [single/legacy_mode]	2m 46s
IT [multi/legacy_mode]	14m 31s
IT [single/fsm_mode]	3m 18s
IT [multi/fsm_mode]	10m 8s
	1h 24m 11s

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