Rename metadata directories

This renames:
 - `tests/wpt/metadata` → `tests/wpt/meta-legacy-layout`
 - `tests/wpt/metadata-layout-2020` → `tests/wpt/meta`
 - `tests/wpt/mozilla/meta` → `tests/wpt/mozilla/meta-legacy-layout`
 - `tests/wpt/mozilla/meta-layout-2020` → `tests/wpt/mozilla/meta`

tests/wpt/meta-legacy-layout/css/css-align/default-alignment/shorthand-serialization-001.html.ini

@@ -0,0 +1,52 @@
+[shorthand-serialization-001.html]
+  [test shorthand serialization {"justifySelf":"unsafe start","shorthand":["auto start","auto unsafe start"\]}]
+    expected: FAIL
+
+  [test shorthand serialization {"justifySelf":"last baseline start","shorthand":""}]
+    expected: FAIL
+
+  [test shorthand serialization {"justifyContent":"safe start","shorthand":"normal safe start"}]
+    expected: FAIL
+
+  [test shorthand serialization {"justifyItems":"left legacy","shorthand":"normal legacy left"}]
+    expected: FAIL
+
+  [test shorthand serialization {"alignContent":"baseline safe right","shorthand":""}]
+    expected: FAIL
+
+  [test shorthand serialization {"justifyItems":"safe start","shorthand":"normal safe start"}]
+    expected: FAIL
+
+  [test shorthand serialization {"alignItems":"stretch","justifyItems":"end","shorthand":"stretch end"}]
+    expected: FAIL
+
+  [test shorthand serialization {"alignItems":"baseline","shorthand":"baseline legacy"}]
+    expected: FAIL
+
+  [test shorthand serialization {"justifyItems":"unsafe start","shorthand":["normal unsafe start"\]}]
+    expected: FAIL
+
+  [test shorthand serialization {"alignSelf":"self-end safe","shorthand":""}]
+    expected: FAIL
+
+  [test shorthand serialization {"justifyContent":"unsafe start","shorthand":["normal unsafe start"\]}]
+    expected: FAIL
+
+  [test shorthand serialization {"justifyItems":"stretch","shorthand":"normal stretch"}]
+    expected: FAIL
+
+  [test shorthand serialization {"alignContent":"center","shorthand":"center normal"}]
+    expected: FAIL
+
+  [test shorthand serialization {"alignContent":"start","justifyContent":"end","shorthand":"start end"}]
+    expected: FAIL
+
+  [test shorthand serialization {"justifyContent":"space-evenly start","shorthand":""}]
+    expected: FAIL
+
+  [test shorthand serialization {"alignItems":"center","shorthand":"center legacy"}]
+    expected: FAIL
+
+  [test shorthand serialization {"alignSelf":"baseline","justifySelf":"last baseline","shorthand":"baseline last baseline"}]
+    expected: FAIL
+