More detailed error on "Service or group not found"

[mnm364]

Problem
When running

edward start ServiceA ServiceB UnknownServiceC

Assuming, all services are found except for UnknownServiceC, we get the following output

Error: Service or group not found

This error message could be more upfront about exactly which service(s) was not found.

Mitigation

Update this error message to list the services that were not found.