e2e: update expected cpu.weight

The opencontainers/cgroups package has updated the v1 shares -> v2
weight conversion to a more accurate formula.

Author: dtrudg

e2e/cgroups/cgroups.go

@@ -615,11 +615,11 @@ var resourceFlagTests = []resourceFlagTest{
 		controllerV1:    "cpu",
 		resourceV1:      "cpu.shares",
 		expectV1:        "123",
-		// Cgroups v2 has a conversion from shares to weight:
-		// weight = (1 + ((cpuShares-2)*9999)/262142)
+		// Cgroups v2 has a conversion from shares to weight.
+		// See https://github.com/opencontainers/cgroups/pull/20
 		delegationV2: "cpu",
 		resourceV2:   "cpu.weight",
-		expectV2:     "5",
+		expectV2:     "20",
 	},
 	{
 		name:            "cpuset-cpus",