Update baremetal_inspect to be compatible with new sdk

Refactors the module to be based off OpenstackModule.

Changes sdk calls to use the proxy layer where appropriate. The
inspection itself stays at the cloud layer to support waiting.

Make sure we convert returned resource objects to dict

Adds a barebones role to test the module. This won't run in CI, since
we don't have the ironic plugin configured in devstack.

Changes the return value of the module to be the entire node, instead of
just the properties that resulted from inspection. Return docs were
updated to reflect this.

Update module params to use `name` as the identifier for the node,
aliasing it to the previous supported values of `id` and `uuid`.

Use module kwargs to specify mutually exclusive params.

Stop catching exceptions and instead let them bubble up so ansible
handles them.

Change-Id: I2b07b58c8b068d7f18db9862fcecb4088328ac74