* Disable source as well as destination on editing
* Various visual/textual amends
* Make errors only appear once you've interacted with a field
* Move tests that involve selecting menus to a create form
* Revert fieldsets and checkboxes
* Disable ability to select destination if not creating
* Add a LegacyID for intentions that don't have them
* Use `/exact/` endpoint for reading single intentions
* Fix up test for new API interaction
* Upgrade consul-api-double
* Comment out tests using destination for the moment
Also, removed any intention related things from the old page-navigation
tests
* Add all the new data required for NodeIdentities
* Add potential NodeIdentity to the token list component
* Amend the policy-form/selector to allow node identity creation
* Fix up CSS for radio buttons and select label
* Add node-identity policy template component
* Fix up and add acceptance tests for NodeIndentities
* Make sure policy previews take node identities into account
* Only show certain policy markup if those we have those policies
* Potentially temporarily hide dt's that don't have icons yet
1. When choosing Services/Nsmapces for intentions you can either choose
a service from autocomplete menus, or write any service name, existing
or not. We previous said this would be a 'Future' service, but it could
also be a service in another datacenter, or a 'virtual service'.
2. Reword the hints underneath the autocomplete menus to reflect point 1
Whilst we tried to do this with the smallest amount of changes possible,
our acceptance tests for trying to submit a blank form started failing
due to usage of `destroyRecord`, its seems that the correct way to
achieve the same thing is to use `rollbackAttributes` instead. We
changed that here and the tests pass once again. Furture work related to
this will involve change the rest of the UI where we use `destroyRecord`
to achieve the same thing, to use `rollbackAttributes` instead
John Cowen