Better naming for resource identities and service ids

[mziccard]

Our XxxInfo classes have two fields with a similar name

• xxxId: this fields is of type XxxId and holds a user-defined identity for the resource
• id: this fields holds a service-generated (opaque) id

We should provide a better naming to easily distinguish the two fields. Possible solutions are:

• renaming id to generatedId (this is the preferred way so far)
• renaming id to opaqueId

Note: this issue also applies to other classes (e.g. compute's DiskImageConfiguration).

[ajkannan]

I'm +1 for generatedId

[mziccard]

Just added the compute label, this must remain open unti fixed in compute.

[aozarov]

I guess this can be closed now?

[mziccard]

Fixed with #832 and #966