Remove obsolete cli flag experimental-local-file-cache (#2437)

* Remove uses of experimental-local-file-cache

CLI flag experimental-local-file-cache was
removed long back and is no longer in use or
in documentation. So, removing the last few
remaining traces of it.

* remove couple more references to experimental-local-file-cache

tools/mount_gcsfuse/main.go

@@ -82,7 +82,6 @@ func makeGcsfuseArgs(
 		// Special case: support mount-like formatting for gcsfuse bool flags.
 		case "implicit_dirs",
 			"foreground",
-			"experimental_local_file_cache",
 			"reuse_token_from_url",
 			"enable_nonexistent_type_cache",
 			"experimental_enable_json_read",

tools/mount_gcsfuse/main_test.go

@@ -36,7 +36,6 @@ func TestMakeGcsfuseArgs(t *testing.T) {
 			name: "TestMakeGcsfuseArgs for BooleanFlags with underscore",
 			opts: map[string]string{"implicit_dirs": "",
 				"foreground":                    "true",
-				"experimental_local_file_cache": "",
 				"reuse_token_from_url":          "false",
 				"enable_nonexistent_type_cache": "",
 				"experimental_enable_json_read": "true",
@@ -46,7 +45,6 @@ func TestMakeGcsfuseArgs(t *testing.T) {
 				"log_rotate_compress":           "false"},
 			expectedFlags: []string{"--implicit-dirs=true",
 				"--foreground=true",
-				"--experimental-local-file-cache=true",
 				"--reuse-token-from-url=false",
 				"--enable-nonexistent-type-cache=true",
 				"--experimental-enable-json-read=true",
@@ -60,7 +58,6 @@ func TestMakeGcsfuseArgs(t *testing.T) {
 			name: "TestMakeGcsfuseArgs for BooleanFlags with hyphens",
 			opts: map[string]string{"implicit_dirs": "",
 				"foreground":                    "true",
-				"experimental-local-file-cache": "",
 				"reuse-token-from-url":          "false",
 				"enable-nonexistent-type-cache": "",
 				"experimental-enable-json-read": "true",
@@ -70,7 +67,6 @@ func TestMakeGcsfuseArgs(t *testing.T) {
 				"log_rotate-compress":           "false"},
 			expectedFlags: []string{"--implicit-dirs=true",
 				"--foreground=true",
-				"--experimental-local-file-cache=true",
 				"--reuse-token-from-url=false",
 				"--enable-nonexistent-type-cache=true",
 				"--experimental-enable-json-read=true",