bandwidth: possibility to exclude some subnets from traffic shaping

what changed:

we had to refactor the bandwidth plugin and switch from a classless qdisc (tbf)
to a classful qdisc (htb).

subnets are to be provided in config or runtimeconfig just like other parameters

unit and integration tests were also adapted in consequence

unrelated changes:

test fixes: the most important tests were just silently skipped due to ginkgo Measure deprecation
(the ones actually checking the effectiveness of the traffic control)

Signed-off-by: Raphael <oOraph@users.noreply.github.com>

plugins/meta/bandwidth/bandwidth_suite_test.go

@@ -33,7 +33,7 @@ import (
 	"github.com/containernetworking/plugins/pkg/ns"
 )
 
-func TestTBF(t *testing.T) {
+func TestHTB(t *testing.T) {
 	RegisterFailHandler(Fail)
 	RunSpecs(t, "plugins/meta/bandwidth")
 }