Add checks for filesystem availability in selinux tests.
Add checks for filesystem availability in selinux tests.

Related: #12

Signed-off-by: mulhern <7b51bcf507bcd7afb72bf8663752c0ddbeb517f6@redhat.com>

rhinstaller/blivet,vpodzime/blivet,AdamWill/blivet,rhinstaller/blivet,AdamWill/blivet,jkonecny12/blivet,rvykydal/blivet,vojtechtrefny/blivet,vojtechtrefny/blivet,vpodzime/blivet,rvykydal/blivet,jkonecny12/blivet