GPII-413/GPII-434: Modified testing files due to Fireball merge.

- gpii.js and index.js:  moved the fluid.require()s of the node
add-ons, including the one for packagekit (device reporter) from
gpii.js to index.js,

- gpii/node_modules/packagekit/test/all-tests.js: now uses
kettle.loadTestingSupport() and removes kettle.test.allTests boolean,

- tests/UnitTests.sh: added the packagekit node add-on tests.