Run bsdiff tests in presubmit.

Add TEST_MAPPING, and fix /data/tmp (which doesn't exist, and which the
code would create itself, meaning that the test only worked if run as
root) to /data/local/tmp (which works for the shell user too).

Test: treehugger
Change-Id: Ib558efc6033bb3aa3410bf8df92fc4f3cd2fc8fe
2 files changed