Changes to the code based on upstreamed packet-python PRs

[grahamc]

I upstreamed most of the patches in packethost/packet-python@03165b2...0aa7e7e (input-output-hk:hardware-reservation's branch at this time) in PRs:

• Device: capture hardware reservation packethost/packet-python#71 device: capture hardware reservation
• Manager.create_device: add support for customdata packethost/packet-python#72 create_device: support customdata
• Device: capture spot_price_max, termination_time, provisioning_percentage packethost/packet-python#73 device: capture spot_price_max, termination_time, provisioning_percentage
• Plan: intake available_in packethost/packet-python#74 plan: intake available_in
• Manager.create_project_ssh_key packethost/packet-python#75 manager: add create_project_ssh_key:

The only commit in packethost/packet-python@03165b2...0aa7e7e I didn't backport is packethost/packet-python@e8bd416, because it is quite gnarly and I think working around an upstream issue -- I'm not sure. Anyway, this change to reservationId is the only thing I think needed -- and the second commit is just the way I've been testing the integrated branch.

Probably shouldn't merge this for now, and instead just use the upstream release once it is done.

[johnalotoski]

The reservationId change has been applied to master. We're pointing to the v1.42.0-patched branch of our packet-python fork as we need the project keys fix commit for now (input-output-hk/packet-python@4baec99 on that branch).