Properly initialize nested struct in influxdb test

If actually running the influxdb tests (not included in Makefile), a
compiler error occured ("cannot use promoted field in struct literal of
type") because direct access to promoted fields is only allowed in
assignments, not when initializing structs (at least, unless
golang/go#9859 gets implemented).

Signed-off-by: Jens Erat <jens.erat@daimler.com>

cmd/internal/storage/influxdb/influxdb_test.go

@@ -360,7 +360,7 @@ func createTestStats() (*info.ContainerInfo, *info.ContainerStats) {
 			"2GB": {Usage: 9876, MaxUsage: 5432, Failcnt: 1},
 		},
 		ReferencedMemory: 12345,
-		PerfStats:        []info.PerfStat{{Cpu: 1, Name: "cycles", ScalingRatio: 1.5, Value: 4589}},
+		PerfStats:        []info.PerfStat{{Cpu: 1, PerfValue: info.PerfValue{Name: "cycles", ScalingRatio: 1.5, Value: 4589}}},
 		Resctrl: info.ResctrlStats{
 			MemoryBandwidth: []info.MemoryBandwidthStats{
 				{TotalBytes: 11234, LocalBytes: 4567},