selftests: tc-testing: use parallel tdc in kselftests

Leverage parallel tests in kselftests using all the available cpus.
We tested this in tuxsuite and locally extensively and it seems it's ready for prime time.
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/tc-testing/tdc.sh

@@ -64,5 +64,5 @@ try_modprobe sch_hfsc
 try_modprobe sch_hhf
 try_modprobe sch_htb
 try_modprobe sch_teql
-./tdc.py -c actions --nobuildebpf
-./tdc.py -c qdisc
+./tdc.py -J`nproc` -c actions --nobuildebpf
+./tdc.py -J`nproc` -c qdisc