Add clarity to server stats displayed in TP

[mitchell852]

I'm submitting a ...

• improvement request (usability, performance, tech debt, etc.)

Traffic Control components affected ...

• Traffic Portal

Current behavior:

^^ these numbers are populated from the api call:

GET api/3.1/servers?type=EDGE

therefore, the labels "online caches", "reported caches", etc are misleading.

New behavior:

Labels should be:

• Online Edge Caches
• Reported Edge Caches
• Offline Edge Caches
• Admin Down Edge Caches

Or an even better solution would be to aggregate the numbers for ALL caches (edges* and mids*) which would require either making a few calls like:

GET api/3.1/servers?type=EDGE
GET api/3.1/servers?type=MID

and summing the results or making an api change to support something like:

GET api/3.1/servers?type=CACHE

which pulls numbers for any server of type EDGE* or MID*

Minimal reproduction of the problem with instructions:

Launch TP. View the cache status in the top right of the TP dashboard.