cpumanager: drop old custom file backend

The cpumanager file-based state backend was obsoleted since few
releases, aving the cpumanager moved to the checkpointmanager common
infrastructure.
The old test checking compatibility to/from the old format is
also no longer needed, because the checkpoint format is stable
(see
https://github.com/kubernetes/kubernetes/tree/master/pkg/kubelet/checkpointmanager).

Signed-off-by: Francesco Romani <[email protected]>

Author: ffromani

pkg/kubelet/cm/cpumanager/state/BUILD

@@ -6,7 +6,6 @@ go_library(
         "checkpoint.go",
         "state.go",
         "state_checkpoint.go",
-        "state_file.go",
         "state_mem.go",
     ],
     importpath = "k8s.io/kubernetes/pkg/kubelet/cm/cpumanager/state",
@@ -24,18 +23,13 @@ go_library(
 
 go_test(
     name = "go_default_test",
-    srcs = [
-        "state_checkpoint_test.go",
-        "state_compatibility_test.go",
-        "state_file_test.go",
-    ],
+    srcs = ["state_checkpoint_test.go"],
     embed = [":go_default_library"],
     deps = [
         "//pkg/kubelet/checkpointmanager:go_default_library",
         "//pkg/kubelet/cm/containermap:go_default_library",
         "//pkg/kubelet/cm/cpumanager/state/testing:go_default_library",
         "//pkg/kubelet/cm/cpuset:go_default_library",
-        "//vendor/github.com/stretchr/testify/require:go_default_library",
     ],
 )