Add a trait indicating (de)serializability
Add a trait indicating (de)serializability

To get more stuff into the program and less into the comments.

The default implementation of setup() is unimplemented, because the
method hasn't been implemented in the source anywhere.

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

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