Totally rework the exabgp integration tests. Instead of a simple shell
script to talk to exabgp api use a small c programm. Use a fifo to
send commands to this program. While exabgp includes a cli tool exactly
for that it is impossible to use.
Use a single config file for multiple sessions and make sure exabgp is
properly killed on exit (pkill exabgp fails since it is a python script).
Introduce a med target to test the route decision process handling med
path. This test currently fails and is not hooked up yet.
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