libdabba: replay the pcap in an endless loop.

More possibilities might come later on but it is a good start.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
libdabba: coding style refactoring.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
test: add replay thread unit test stubs.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>