Merge pull request #7239 from jboeuf/fix_7182

Change the return status codes according to the doc
diff --git a/src/core/lib/security/transport/client_auth_filter.c b/src/core/lib/security/transport/client_auth_filter.c
index 14ccf72..ed7929a 100644
--- a/src/core/lib/security/transport/client_auth_filter.c
+++ b/src/core/lib/security/transport/client_auth_filter.c
@@ -176,7 +176,7 @@
     calld->creds = grpc_composite_call_credentials_create(channel_call_creds,
                                                           ctx->creds, NULL);
     if (calld->creds == NULL) {
-      bubble_up_error(exec_ctx, elem, GRPC_STATUS_INTERNAL,
+      bubble_up_error(exec_ctx, elem, GRPC_STATUS_UNAUTHENTICATED,
                       "Incompatible credentials set on channel and call.");
       return;
     }
@@ -205,7 +205,7 @@
     char *error_msg;
     gpr_asprintf(&error_msg, "Invalid host %s set in :authority metadata.",
                  grpc_mdstr_as_c_string(calld->host));
-    bubble_up_error(exec_ctx, elem, GRPC_STATUS_INTERNAL, error_msg);
+    bubble_up_error(exec_ctx, elem, GRPC_STATUS_UNAUTHENTICATED, error_msg);
     gpr_free(error_msg);
   }
 }