[cipd] Rename new Root terminology to Subdir.

cipd/client/cipd/ensure/good_test.go

Index: cipd/client/cipd/ensure/good_test.go
diff --git a/cipd/client/cipd/ensure/good_test.go b/cipd/client/cipd/ensure/good_test.go
index d65593bc75dfd2b8766d318e15c9d14bcdf2c038..2c6bdb277718ceab2e65761a3226310d223dd734 100644
--- a/cipd/client/cipd/ensure/good_test.go
+++ b/cipd/client/cipd/ensure/good_test.go
@@ -36,7 +36,7 @@ var goodEnsureFiles = []struct {
 			"path/to/other_package some_tag:version",
 			"path/to/yet_another a_ref",
 		),
-		&ResolvedFile{"", common.PinSliceByRoot{
+		&ResolvedFile{"", common.PinSliceBySubdir{
 			"": {
 				p("path/to/package", "deadbeefdeadbeefdeadbeefdeadbeefdeadbeef"),
 				p("path/to/other_package", "some_tag:version"),
@@ -50,7 +50,7 @@ var goodEnsureFiles = []struct {
 		f(
 			"path/to/package/${platform}-${arch} latest",
 		),
-		&ResolvedFile{"", common.PinSliceByRoot{
+		&ResolvedFile{"", common.PinSliceBySubdir{
 			"": {
 				p("path/to/package/test_plat-test_arch", "latest"),
 			},
@@ -62,7 +62,7 @@ var goodEnsureFiles = []struct {
 		f(
 			"path/to/package/${platform}-${arch=neep,test_arch} latest",
 		),
-		&ResolvedFile{"", common.PinSliceByRoot{
+		&ResolvedFile{"", common.PinSliceBySubdir{
 			"": {p("path/to/package/test_plat-test_arch", "latest")},
 		}},
 	},
@@ -72,22 +72,22 @@ var goodEnsureFiles = []struct {
 		f(
 			"path/to/package/${platform=spaz}-${arch=neep,test_arch} latest",
 		),
-		&ResolvedFile{"", common.PinSliceByRoot{}},
+		&ResolvedFile{"", common.PinSliceBySubdir{}},
 	},
 
 	{
-		"Root directives",
+		"Subdir directives",
 		f(
 			"some/package latest",
 			"",
-			"@Root a/subdir with spaces",
+			"@Subdir a/subdir with spaces",
 			"some/package canary",
 			"some/other/package tag:value",
 			"",
-			"@Root", // reset back to empty
+			"@Subdir", // reset back to empty
 			"cool/package beef",
 		),
-		&ResolvedFile{"", common.PinSliceByRoot{
+		&ResolvedFile{"", common.PinSliceBySubdir{
 			"": {
 				p("some/package", "latest"),
 				p("cool/package", "beef"),
@@ -106,7 +106,7 @@ var goodEnsureFiles = []struct {
 			"",
 			"some/package version",
 		),
-		&ResolvedFile{"https://cipd.example.com/path/to/thing", common.PinSliceByRoot{
+		&ResolvedFile{"https://cipd.example.com/path/to/thing", common.PinSliceBySubdir{
 			"": {
 				p("some/package", "version"),
 			},