tmf: Remove usage of ICoreRunnable for time graph build job

tmf: Remove usage of ICoreRunnable for time graph build job

ICoreRunnable is only in Eclipse 4.6. We can create the job the old
way to restore compatibility with Eclipse 4.5 and there is no loss
of functionality.

Change-Id: I72091a016df3f63eda5c009104c065d4f72f379b
Signed-off-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/79545
Reviewed-by: Hudson CI
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>