fio-tests: add multi-filesystem testing support #233

Job	Run time
kdevops-ci: blktests_nvme	4m 13s
kdevops-ci: xfs_reflink_4k	20m 5s
Generate Kernel Reference for Scheduled Runs	0s
Check Linux kernel Git Reference	0s
Generate Kernel Reference for Scheduled Runs	-455315s
Check Linux kernel Git Reference	-455315s
kdevops-ci: blktests_nvme	16m 12s
kdevops-ci: xfs_reflink_4k	20m 5s
	-906995s

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