Add support for spot market

[vielmetti]

Packet now has support for a "spot market" for interruptible, reduced price instances. There's a brief bit of documentation at

https://help.packet.net/technical/deployment-options/spot-market

Two commands to add to support this:

• packet admin spot-prices - "will provide the current prices for each Packet facility and plan."
• packet baremetal create-device - add optional flag to set spot market price bid (spot_price_max)

I think the first of these is relatively straightforward; the second one, perhaps will take a little thinking, especially in handling error conditions.

[ebsarr]

@vielmetti : I'm starting to catch up with the additions in the packet API. For the spot instance creation, do the flags below make sense?

• --spot-instance : set the spot_instance parameter in the API call true,

• spot-price-max: set spot market price bid

For the error handling part I'll run some tests and see what happens, as it's not obvious from the docs.

[vielmetti]

Thanks @ebsarr . If you run into weird error conditions report them here and I'll make sure they get a review and that the documentation gets updated anywhere it's unclear. Your plan sounds good to me.

[ebsarr]

@vielmetti : try v2.1