test_all: ignore index tests which download HTML on koofr and opendrive

Koofr refuses to download the HTML listings written by the index tests
with "FileBlocked: File download restricted due to possible dangerous
content" and OpenDrive refuses with 403 Forbidden, so the tests can't
read back what they wrote. The index tests which write other formats
still run.

fstest/test_all/config.yaml

@@ -527,6 +527,17 @@ backends:
  - backend:  "opendrive"
    remote:   "TestOpenDrive:"
    fastlist: false
+   ignore:
+     # downloading the HTML listings is refused with 403 Forbidden
+     - TestIndex
+     - TestIndexDelete
+     - TestIndexFilter
+     - TestIndexRules
+     - TestIndexMaxDepth
+     - TestIndexLinkIndex
+     - TestIndexChanged
+     - TestIndexChangedDelete
+     - TestIndexChangedFiles
    ignoretests:
      - cmd/bisync
  - backend:  "union"
@@ -535,6 +546,17 @@ backends:
  - backend:  "koofr"
    remote:   "TestKoofr:"
    fastlist: false
+   ignore:
+     # downloading the HTML listings is refused with FileBlocked
+     - TestIndex
+     - TestIndexDelete
+     - TestIndexFilter
+     - TestIndexRules
+     - TestIndexMaxDepth
+     - TestIndexLinkIndex
+     - TestIndexChanged
+     - TestIndexChangedDelete
+     - TestIndexChangedFiles
  # - backend:  "koofr"
  #   remote:   "TestDigiStorage:"
  #   fastlist: false