Add a global test setup file

Set up generally useful stuff:

* chai.should()
* logger stubs
* globals in SandboxedModule, including Buffer and process, which are
  now required in Node 12

services/clsi/test/acceptance/js/ExampleDocumentTests.js

@@ -17,7 +17,6 @@
  */
 const Client = require('./helpers/Client')
 const request = require('request')
-require('chai').should()
 const fs = require('fs')
 const fsExtra = require('fs-extra')
 const ChildProcess = require('child_process')