Add missing license header to mda.rs
Add missing license header to mda.rs

It got omitted when the module was split off from bda.rs.

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

stratis-storage/stratisd,stratis-storage/stratisd,stratis-storage/stratisd