provide old ABI levels via backward compatibility of new DPDK libraries.

provide old ABI levels via backward compatibility of new DPDK libraries.

The cross dependencies in DPDK libraries would force us to conflict
with older ABI versions to avoid double ld.so resolution
(https://lists.ubuntu.com/archives/ubuntu-devel/2017-February/039659.html)

The conflicts would make the old versions and thereby the dependent
applications non-installable until there is a rebuild (as other updates
would do).
But for our case that would deny most benefits of version named
libraries.

Instead of adding a conflicts - whenever possible - provide a backward
compatible wrapper symlinking to the new (ABI compatible) implementation.

Change-Id: If9fa9cb9474ad0ac555bdf1a0c72f701ddaf2926
Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>