Change device type from Network to Optical for some optical gear

Today I discovered that Observium has more device types available than it did, i don't know, years ago. "Optical" is one of them.

Type for some low hanging fruit should be changed for optical, the ones we use and are aware of - Ciena (a few types, not packet), Infinera, Coriant Groove are included.

Likely more device types should exist, but these are the ones we're positive about.