fio-tests: add multi-filesystem testing support #110

Job	Run time
Build kdevops Container (debian)	2m 9s
Build kdevops Container (opensuse)	1m 54s
Build kdevops Container (fedora)	1m 28s
Linux A/B Tests (fedora)	47s
Linux A/B Tests (debian)	1m 5s
Linux A/B Tests (opensuse)	56s
Quick Config Tests (blktests_nvme) on fedora	41s
Quick Config Tests (blktests_nvme) on debian	49s
Quick Config Tests (blktests_nvme) on opensuse	48s
Quick Config Tests (xfs_reflink_4k) on fedora	46s
Quick Config Tests (xfs_reflink_4k) on debian	53s
Quick Config Tests (lbs-xfs) on opensuse	56s
Quick Config Tests (lbs-xfs) on debian	50s
Quick Config Tests (lbs-xfs) on fedora	42s
Quick Config Tests (linux-ab-testing) on opensuse	48s
Quick Config Tests (linux-ab-testing) on fedora	43s
Quick Config Tests (xfs_reflink_4k) on opensuse	48s
Quick Config Tests (linux-ab-testing) on debian	49s
	17m 52s

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