Upgraded test harness

Upgraded test harness

A new Serial mode has been added to the test harness that will run
test cases in serial without using Testkit Lite. This executes all
the dali test cases in ~35 seconds, and dumps the test case output
to stdout/stderr. It can be run using "execute.sh -S"

Have changed the Parallel mode to always re-run failing test cases,
causing it to display the failing checks.

All types of execution now write to summary.xml, and display a human
readable version of it before exiting.

execute.sh's exit status has been changed - 0 means no failures,
1 means there was a test case failure.

Ensured TestGLAbstraction initialization covers all member variables.

Change-Id: I14c46b190f0ab4c832746971f39a4ecce0eee03d
Signed-off-by: David Steele <david.steele@samsung.com>