cgroups: remove ErrCgroupV1Rootless code

Signed-off-by: Lokesh Mandvekar <[email protected]>

Author: lsm5

common/pkg/cgroups/cgroups_linux.go

@@ -28,9 +28,7 @@ import (
 var (
 	// ErrCgroupDeleted means the cgroup was deleted.
 	ErrCgroupDeleted = errors.New("cgroup deleted")
-	// ErrCgroupV1Rootless means the cgroup v1 were attempted to be used in rootless environment.
-	ErrCgroupV1Rootless = errors.New("no support for CGroups V1 in rootless environments")
-	ErrStatCgroup       = errors.New("no cgroup available for gathering user statistics")
+	ErrStatCgroup    = errors.New("no cgroup available for gathering user statistics")
 
 	isUnifiedOnce sync.Once
 	isUnified     bool