There is a bug in travis because the APT source is not authenticated, but we have no way to pass some more options to apt.
Anyway now we can switch to an Ubuntu that has GCC >=4.8 by default
(required for C++ 11), that's cleaner.
Also upgrade tcpdump to 4.9.3 as 4.7.3 does not compile with recent GCC, fix DPDK CPU architecture because newer machines may have newer CPUs and therefore DPDK could compile on a new CPU architecture, but run on an old, and a little DPDK compilation fix.
There is a bug in travis because the APT source is not authenticated, but we have no way to pass some more options to apt.
Anyway now we can switch to an Ubuntu that has GCC >=4.8 by default (required for C++ 11), that's cleaner.
Also upgrade tcpdump to 4.9.3 as 4.7.3 does not compile with recent GCC, fix DPDK CPU architecture because newer machines may have newer CPUs and therefore DPDK could compile on a new CPU architecture, but run on an old, and a little DPDK compilation fix.