Add device_memory information to DetailedDevice

[sungo]

We are extracting information about the memory in a device from the device report into the device_memory table. Near as I can tell, this data is inaccessible from the API. I'd like to see it added to the DetailedDevice response so it is available via GET /device/:serial

[sungo]

See also #551

[karenetheridge]

We are extracting information about the memory in a device from the device report into the device_memory table

We're not, actually. At least, I see no code that inserts into that table, and that table is empty in the backup from production from ~September that I'm using. We'll need some specifications around that section of the report so we know how to fetch that data; I'll punt this over to #551.

[sungo]

Looking through livesys, specifically https://github.com/joyent/conch-livesys/blob/master/Conch-Reporter/lib/Conch/Reporter/Collect/Memory.pm , I don't think we're even collecting all the data we need to fill the table in the database.

[karenetheridge]

question for reporter folks: do we care about what slot a dimm is in? can/should that just be inferred from the array index?

[sungo]

We care about it for reporting purposes. It's important to know exactly which dimm is busted so integrators don't waste time guessing

[sungo]

Obsoleted by #650