function test fetch results
This is an optional base test script function, which retrieves test
results from the board, after a test has completed. This is used
when the default fetch of the testlog (as produced by standard output
of 'report' operations) is not sufficient.
For example, LTP produces results data in lots of other files.
Here are some sample invocations:
Returns non-zero on error.
Located in base test script.