Spot Instances, includes tagging and EBS

[3vcloud]

Forked original vagrant-aws repo to be able to submit pull request.

Added code changes from https://github.com/3vcloud/vagrant-aws , thanks to https://github.com/KariusDx/vagrant-aws for original spot functionality.

This commit allows spot instances to be created; the process in synchronous - waiting for the spot request to be successful before continuing. Cancels spot request after server is up.

[3vcloud]

https://github.com/mitchellh/vagrant-aws/issues/32 https://github.com/mitchellh/vagrant-aws/issues/338

[mkubenka]

Running without any tags produce error:

There was an error talking to AWS. The error message is shown
below:

InvalidParameterValue => You must specify one or more tags to create

[MixmasterFresh]

Is this pull request still being moved forward, or should someone else pick it up?

[javnav]

Does this pull request interest to other people? I am really interested in this feature.