Running scripts with 'set -e' produces silent failures with no
diagnostic. Add an exit handler which produces diagnostics, including
details of what was running if the shell seems to be bash.
(Bitbake rev: e213e6a4c297a4f1c22eed15bd7b4cbc0e9eab4f)
Signed-off-by: Peter Seebach <peter.seebach@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>