buildenv: fail build if create_devtools_package fails
buildenv: fail build if create_devtools_package fails

If an internal command of create_devtools_package.sh script fails, the script
will continue without failing, leading in missing packages at the end of the
ci_full build, without any obvious error.

This patch fixes this issue and makes the build stopping in case of error.

Tracked-On: EDISON-2164
Signed-off-by: Simon Desfarges <92a5287c79a3a86956c2e8acc6f9cba89fe417f8@intel.com>

htot/meta-intel-edison,oesile/meta-intel-edison,htot/meta-intel-edison,oesile/meta-intel-edison,oesile/meta-intel-edison,htot/meta-intel-edison,oesile/meta-intel-edison,htot/meta-intel-edison,htot/meta-intel-edison,oesile/meta-intel-edison,oesile/meta-intel-edison,oesile/meta-intel-edison,oesile/meta-intel-edison