i3en.xlarge is currently not getting tuned properly. A quick test using
Scylla AMI ( ami-07a31481e4394d346 ) reveals that the storage
capabilities under this instance are greatly reduced:
$ grep iops /etc/scylla.d/io_properties.yaml
read_iops: 257024
write_iops: 174080
This patch corrects this typo, in such a way that iotune now properly
tunes this instance type.
Closes#9298