tc-testing: use a plugin to build eBPF program

use a TDC plugin, instead of building eBPF programs in the 'setup' stage.
'-B' argument can be used to build eBPF programs in $EBPFDIR directory,
in the 'pre-suite' stage. Binaries are then cleaned in 'post-suite' stage.

Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/tc-testing/README

@@ -232,6 +232,8 @@ directory:
       and the other is a test whether the command leaked memory or not.
       (This one is a preliminary version, it may not work quite right yet,
       but the overall template is there and it should only need tweaks.)
+  - buildebpfPlugin.py:
+      builds all programs in $EBPFDIR.
 
 
 ACKNOWLEDGEMENTS