There's a time delay between packets are sent through the system and
tcpdump reads, buffers and stores them into the pcap file. We need to
give it more time to process everything before killing it, otherwise
last (or all) packets from the test are not captured.
Change-Id: I240d8f1bdb2ca6ad353e60ef15937dc2bd4cbebd
Let's make sure we share common configuration between the test
suites and split the config file into a "default" part which is
used (but not copied) in the Docker images, and a "local" part
which is basically those overrides that the user (or docker image)
wants to do from the default.
Change-Id: I3db452e24e5238aa05254d903739c64d202e61db