Tests can now be run either in a local build or on an attached
device. The script tries to infer the correct mode of operation
but it can also be specified on the command line.
Test: Ran break-tests.sh in both modes
Change-Id: I515ac0cede23e2cb775b99e0af8108a3ce0bde37
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/53585
Reviewed-by: Adam Langley <agl@google.com>