package_[deb|ipk]: improve multiprocess logic when creating deb/ipk packages
Current implementation does not handle possible exceptions coming from child
processes, the latter responsible for creating packages. With the aim to have more
control, use pipes to communicate exceptions and stop package creation in case
of failure.
Helps to debug [YOCTO #12012].
Signed-off-by: Leonardo Sandoval <leonardo.sandoval.gonzalez@linux.intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
