compat/info.go: TrimPrefix(CGroupsVersion, "v")

For compatibility with Docker: 846b7e24ba/api/swagger.yaml (L4528-L4534)

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

pkg/api/handlers/compat/info.go

@@ -119,7 +119,7 @@ func GetInfo(w http.ResponseWriter, r *http.Request) {
 		BuildahVersion:     infoData.Host.BuildahVersion,
 		CPURealtimePeriod:  sysInfo.CPURealtimePeriod,
 		CPURealtimeRuntime: sysInfo.CPURealtimeRuntime,
-		CgroupVersion:      infoData.Host.CGroupsVersion,
+		CgroupVersion:      strings.TrimPrefix(infoData.Host.CGroupsVersion, "v"),
 		Rootless:           rootless.IsRootless(),
 		SwapFree:           infoData.Host.SwapFree,
 		SwapTotal:          infoData.Host.SwapTotal,