Add a function called write_sectors
Add a function called write_sectors

Implement wipe_sectors() in terms of write_sectors().
Sometimes, you want to do something different than zero a bunch of sectors.

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

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