We currently do not store reservation id, the number, which is useful for figuring out owner of the instance.

While on it, I also noticed that we use fairly long "rhhhc" prefix, I propose to shorten it just to "rh".

Additionally, I noticed that AWS keys allows colons while GCP does not. Therefore I propose to use "rh-" (with dash characters) for both AWS and GCP.

The "rid" key is already used for unique identifier we generate during GCP launch, so I renamed it to "rh-uuid". It serves for identifying instances, "rh-rid" is now used for reservation numeric id. It could be used to the the same as well, but I do not want to change code too much.

Finally, keypair id was renamed to "rh-kid" to avoid too generic "id".