Add a Data Disk

[benofben]

Right now we're just using the boot volume to store the database.

[benofben]

Given that CB is memory first, the storage may make little difference, so RAIDing a bunch of drives probably isn't needed. We can just have one big one.

[benofben]

Seems like this is probably done in the branch.

[benofben]

While the disk may be there, looks like CB isn't being configured to use it @OguzPastirmaci

[benofben]

The block isn't being generated dynamically. Instead it's static right now. I'm skeptical that's going to generalize to what the generator spits out. https://github.com/cloud-partners/oci-couchbase/blob/master/generator/block.tf

There's an additional issue in that it's using remote exec. I think that exposes us to concurrency with the cloud init.

[benofben]

The block size should go in the yaml under group, not as a top level var. https://github.com/cloud-partners/oci-couchbase/blob/df59429e48f852c768240902413da84be930854c/generator/variables.tf#L17