ci: Fail shippable if something fails catastrophically

Before run_ci.sh was introduced, if some command in the
.shippable.yml script failed, Shippable would stop and report
a failure.
When run_ci.sh was introduced we lost this, which is pretty
dangerous if something fails cathastrophically and the xml
reports are not (properly) generated and copied, as then
Shippable reports a pass.
=> Run run_ci.sh in -e mode, so we propagate a bad failure upwards

Signed-off-by: Alberto Escolar Piedras <alpi@oticon.com>