Add a test to verify proper behavior when reading MDAHeaders
Add a test to verify proper behavior when reading MDAHeaders

This test verifies reading of not yet stamped MDAHeaders, since that is
what the fix is about.

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

trgill/stratisd,trgill/stratisd,mulkieran/stratisd,mulkieran/stratisd,stratis-storage/stratisd,stratis-storage/stratisd,stratis-storage/stratisd