Add HACKING.rst to tarball generation bug 1001220
Add HACKING.rst to tarball generation
bug 1001220

Change-Id: I808f8d50dc77fc633728e29708802e8292240e84

stackforge/networking-mlnx,moshele/networking-mlnx,openstack/networking-mlnx,stackforge/networking-mlnx,moshele/networking-mlnx-master,openstack/networking-mlnx