Changes to Test API and loadservice.js to support updateServiceParams method

Changed Test API html page to support multiple services with the same serviceAddress
Changes to load API modules just once this relies on the updateServiceParams method changes
Removed hard coded reference to webinos-utilities while looking for webinos-api-test for service configuration.
Added updateServiceParams method to the Test API (for the configuration of Test API services without reinitialising every time the whole module)
Changed the description of Test API services adding information about the returned value.
Added config / template for service configuration

Jira issue: WP-933