Set exit code 1 for failed tests.
Set exit code 1 for failed tests.

There is a bug in nodeunit in which the exit code is 0 even if
there is a failure in a test which is not in the last directory
tested. See https://github.com/caolan/nodeunit/issues/335
If that is fixed, this can be reverted.

F5Networks/f5-cloud-libs,F5Networks/f5-cloud-libs,F5Networks/f5-cloud-libs,F5Networks/f5-cloud-libs,F5Networks/f5-cloud-libs