run-test build: Don't merge the shards by default.

The rules create one big zip at the end of the build.

However, the runner has logic to access the correct
shard directly now.  So the big zip isn't needed.

Avoid creating the zip to slightly speed up the build.

Test: m art-run-test-{jvm,host,target}-data
Change-Id: I8249ae96c75902f4f1fb056ae2b1001db0ba8d9c
2 files changed