Takashi Kajinami 3b421746b8 Add CentOS/RHEL 9 to supported operating systems
... because these operating systems are now verified by unit tests and
integration tests.

Change-Id: If8180701880e4d0fed3e0777a6d0a8a5edd3814b
2022-02-23 01:39:18 +09:00
..