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/parsing/gap-computed.html.ini

@@ -0,0 +1,67 @@
+[gap-computed.html]
+  [Property gap value '10px 20%' computes to '10px 20%']
+    expected: FAIL
+
+  [Property gap value '10px' computes to '10px']
+    expected: FAIL
+
+  [Property gap value 'normal 10px' computes to 'normal 10px']
+    expected: FAIL
+
+  [Property gap value '20% calc(20% + 10px)' computes to '20% calc(20% + 10px)']
+    expected: FAIL
+
+  [Property gap value 'calc(20% + 10px) normal' computes to 'calc(20% + 10px) normal']
+    expected: FAIL
+
+  [Property gap value 'calc(20% + 10px)' computes to 'calc(20% + 10px)']
+    expected: FAIL
+
+  [Property gap value 'calc(-0.5em + 10px) calc(0.5em + 10px)' computes to '0px 30px']
+    expected: FAIL
+
+  [Property gap value 'calc(0.5em + 10px)' computes to '30px']
+    expected: FAIL
+
+  [Property gap value 'normal' computes to 'normal']
+    expected: FAIL
+
+  [Property gap value '20%' computes to '20%']
+    expected: FAIL
+
+  [Property gap value 'calc(-0.5em + 10px)' computes to '0px']
+    expected: FAIL
+
+  [Property gap value '20% calc(20% + 10px)']
+    expected: FAIL
+
+  [Property gap value 'normal']
+    expected: FAIL
+
+  [Property gap value 'normal 10px']
+    expected: FAIL
+
+  [Property gap value '20%']
+    expected: FAIL
+
+  [Property gap value '10px']
+    expected: FAIL
+
+  [Property gap value '10px 20%']
+    expected: FAIL
+
+  [Property gap value 'calc(-0.5em + 10px) calc(0.5em + 10px)']
+    expected: FAIL
+
+  [Property gap value 'calc(20% + 10px) normal']
+    expected: FAIL
+
+  [Property gap value 'calc(20% + 10px)']
+    expected: FAIL
+
+  [Property gap value 'calc(-0.5em + 10px)']
+    expected: FAIL
+
+  [Property gap value 'calc(0.5em + 10px)']
+    expected: FAIL
+