Added config / template for service configuration

config file (config.json) has now instances information in its
structure.

Jira issue: WP-933
Added updateServiceParams method to the Test API

This method make it possible to update 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.

Jira issue: WP-933
Removed hard coded reference to webinos-utilities

while looking for webinos-api-test for service configuration.

Jira issue: WP-933
Changes to load API modules just once

this relies on the updateServiceParams method changes

Jira issue: WP-933
Changed Test API html page

to support multiple services with the same serviceAddress

Jira issue: WP-933
Merge pull request #70 from smonteleone/WP-933

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