Stop silently ignoring invalid 'server create --hint' options

The '--hint' option for 'server create' expects a key-value pair like so:

  openstack server create --hint group=245e1dfe-2d0e-4139-80a9-fce124948896 ...

However, the command doesn't complain if this isn't the case, meaning
typos like the below aren't indicated to the user:

  openstack server create --hint 245e1dfe-2d0e-4139-80a9-fce124948896

Due to how we'd implemented this here, this ultimately results in us
POSTing the following as part of the body to 'os-servers':

  {
    ...
    "OS-SCH-HNT:scheduler_hints": {
      "245e1dfe-2d0e-4139-80a9-fce124948896": null
    }
    ...
  }

Which is unfortunately allowed and ignored by nova due to the use of
'additionalProperties' in the schema [1]

Do what we do for loads of other options and explicitly fail on invalid
values. This involves adding a new argparse action since none of those
defined in osc-lib work for us. This is included here to ease
backporting of the fix but will be moved to osc-lib in a future patch.

[1] https://github.com/openstack/nova/blob/19.0.0/nova/api/openstack/compute/schemas/servers.py#L142-L146

Change-Id: I9e96d2978912c8dfeadae4a782c481a17cd7e348
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>
Story: #2006628
Task: #36840
Related-Bug: #1845322

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