FABRID bw-tester with validation at destination

[marcodermatt]

Changes:

• Add -fabridquery flag to bwtest-client to send FABRID packets
• Add --fabrid flag to bwtest-server to validate FABRID packets
• Add FabridSelector to pan, which initialized FABRID dataplane paths

Todo:

• Potentially add FABRID flag to bwtest parameters to explicitly request server->client FABRID traffic

Usage:

• Requires netsec-ethz/scion
  1. Clone scion and scion-apps repos in same parent folder
  2. In parent folder run go work init and go work use -r .
  3. In scion-apps folder, make should complete without errors
• Server and client default to 127.0.0.1 as local address. If the IP of the SD differs (e.g. when testing locally), use the -local and --listen flags for client and server respectively to set the same IP. Otherwise DRKey requests will fail.
  Example on tiny4.topo topology:

SCION_DAEMON_ADDRESS=127.0.0.19:30255 ./bin/scion-bwtestserver --fabrid --listen 127.0.0.19:40002
SCION_DAEMON_ADDRESS=127.0.0.27:30255 ./bin/scion-bwtestclient -s 1-ff00:0:111,127.0.0.19:40002 --fabridquery 0-0#0,0@0 -local 127.0.0.27:0

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This change is