Added support for *-tests named files

ION unit tests and Dalvik VM unit tests produce binaries which names end
with -tests. Now lava-blackbox will use these files for performing tests.
Also updated location of some other test files. Mose of the reside in
/data/nativetests now.

Signed-off-by: Milosz Wasilewski <milosz.wasilewski@linaro.org>