This patch,
1. Renames 'System Tests' to 'Functional Tests'.
2. Reduces LOC by using ddt.
3. Removes test dependencies & the numbering convention used earlier.
4. Re-organizes the test suite structure.
blueprint refactor-system-tests
Change-Id: Ife236abf867b678beb72ea3a26a06d895ed8ad4b
eedbc417ea