This suite just verifies that upgrades work with no file system present. In
particular, catch that MDSMonitor doesn't blow up somehow with version
mismatches.

This suite has always been tested upgrading to the latest release,
66fd89a860e3a3258849105d7f9149f5baf804b8 added pacific to reef upgrade since
reef was the latest release at that point. So this suite should upgrade from
N-1|N-2 to main.
