The DockerTestUtils.execute() method copies the entire STDOUT of the child docker process to the main test process output. Tests use "-Xlog:os+container=trace", which is needed for results verification, but produces a lot of output.

There is so much output that JTReg trims it, thus often trimming important diagnostic information.

Proposed solution is to limit the amount of output copied from the child to a parent process. This should not affect test verification/assertion logic, since that logic operates on the child output provided by the output analyzer.