Adding tests, logging, and remaining commands

[joshmarsh]

Summary

This PR essentially "matures" the CLI from POC status to something that you can use.

Related PRs

Optum/dce#106 corrects syntax that prevents go-swagger from generating client response models.

Code Review Tips

• client/, models/, and mocks/ all contain autogenerated code.
• The commands in the Makefile are listed in the order they should be run to generate said code.
• export DCE_LOG_LEVEL=DEBUG for debug logs.

Work contained in this PR

• Added mocks for testing
• Added leveled logging (So we can have debug logs without effecting output users see)
• Implemented tests on things that aren't autogenerated
• Added swagger autogenerated api client
• Implemented dce accounts list, dce accounts describe, dce leases list, dce leases describe, dce leases login, and dce usage
• Added tf var configuration flags dce system deploy
• Removed user and log command stubs
• Added Makefile with steps for autogenerating swagger client and mocks
• Removed redundant aws credentials from config

[joshmarsh]

The idomatic way of exiting with status 1 in go seems to be log.Fatal(). Added log.End() to exit 0 in cases where we need to end gracefully (e.g. user responds "no" to a confirmation prompt).

[joshmarsh]

This allows us to use idiomatic syntax like log.Info() while still using the injected logger, as opposed to s.Observation.Info().

[eschwartz]

👾

[joshmarsh]

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