automated: sh-test-lib: error_msg: exit with non-zero

LAVA uses '-e' in run.sh. I though we should try to save as many results
as possible by always exiting with zero so that the following
'send-to-lava.sh' step will be executed even when test script exit with
non-zero.

However, in this way, LAVA will record test run as pass even something
went wrong and there is no result at all.

Always exit with non-zero when error occurs should be the right
approach, at least for error_msg() function. In the abnormally exiting
cases, we will need to investigate test log in any way.

Change-Id: Iaaa5d141878734dea3cd9860dd6779e5d09e10b1
Signed-off-by: Chase Qi <chase.qi@linaro.org>

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