Blacklist more host fdsan tests.

Test: art/tools/run-libcore-tests.sh --mode=host
Change-Id: I6e16b4c0c720f2356e913318a84200245ba37ab7
diff --git a/tools/libcore_failures.txt b/tools/libcore_failures.txt
index d83c522..4c9fd96 100644
--- a/tools/libcore_failures.txt
+++ b/tools/libcore_failures.txt
@@ -223,6 +223,8 @@
   names: ["libcore.libcore.io.FdsanTest#testFileInputStream",
           "libcore.libcore.io.FdsanTest#testFileOutputStream",
           "libcore.libcore.io.FdsanTest#testRandomAccessFile",
-          "libcore.libcore.io.FdsanTest#testParcelFileDescriptor"]
+          "libcore.libcore.io.FdsanTest#testParcelFileDescriptor",
+          "libcore.libcore.io.FdsanTest#testDatagramSocket",
+          "libcore.libcore.io.FdsanTest#testSocket"]
 }
 ]