The mocks where using randomly generated `ExternalSources` this change
makes sure they are fixed so we can reliably test the values. No change
to actual UI code
1. Addition of external source icons for services marked as such.
2. New %with-tooltip css component (wip)
3. New 'no healthcheck' icon as external sources might not have
healthchecks, also minus icon on node cards in the service detail view
4. If a service doesn't have healthchecks, we use the [Services] tabs as the
default instead of the [Health Checks] tab in the Service detail page.
5. `css-var` helper. The idea here is that it will eventually be
replaced with pure css custom properties instead of having to use JS. It
would be nice to be able to build the css variables into the JS at build
time (you'd probably still want to specify in config which variables you
wanted available in JS), but that's possible future work.
Lastly there is probably a tiny bit more testing edits here than usual,
I noticed that there was an area where the dynamic mocking wasn't
happening, it was just using the mocks from consul-api-double, the mocks
I was 'dynamically' setting happened to be the same as the ones in
consul-api-double. I've fixed this here also but it wasn't effecting
anything until actually made certain values dynamic.
1. Check the dc's model for both dcs list and the requested dc.
2. If the dc model doesn't exist use and empty array for dcs and a fake
dc with the Name 'Error' as we can't even trust what is in the
`paramsFor`
