Merge pull request #2621 from ctiller/forgetful-frederic-feeds-frogs-frankfurts

Fix interop tests by ensuring non-http-special metadata precedes otheā€¦
diff --git a/src/core/channel/compress_filter.c b/src/core/channel/compress_filter.c
index 14cb3da..bf02f92 100644
--- a/src/core/channel/compress_filter.c
+++ b/src/core/channel/compress_filter.c
@@ -200,7 +200,7 @@
                 channeld->default_compression_algorithm;
             calld->has_compression_algorithm = 1; /* GPR_TRUE */
           }
-          grpc_metadata_batch_add_head(
+          grpc_metadata_batch_add_tail(
               &(sop->data.metadata), &calld->compression_algorithm_storage,
               grpc_mdelem_ref(channeld->mdelem_compression_algorithms
                                   [calld->compression_algorithm]));