Make the build_and_run_all_unit_tests script push individual tests
instead of doing a full sync, makes it easier to run unit tests
against release builds.
Merge of https://widevine-internal-review.googlesource.com/#/c/8405/
from the widevine cdm repo.
Change-Id: I8efda77be9ab863f616fab88c4782b7c9edb8858