Use majority write concern and remove assert in change stream tests (#1980)

* use majority write concern in change stream test

* do not assert that resume token changed after receiving no documents

Author: kevinAlbs

src/libmongoc/tests/test-mongoc-change-stream.c

@@ -353,14 +353,10 @@ test_change_stream_live_track_resume_token (void *test_ctx)
    ASSERT (bson_compare (resume_token, &doc1_rt) != 0);
    bson_copy_to (resume_token, &doc2_rt);
 
-   /* There are no docs left. But the next call should still keep the same
-    * resume token */
+   /* There are no docs left. */
    ASSERT (!mongoc_change_stream_next (stream, &next_doc));
    ASSERT_OR_PRINT (!mongoc_change_stream_error_document (stream, &error, NULL), error);
    ASSERT (!next_doc);
-   resume_token = mongoc_change_stream_get_resume_token (stream);
-   ASSERT (!bson_empty0 (resume_token));
-   ASSERT (bson_compare (resume_token, &doc2_rt) == 0);
 
    bson_destroy (&doc0_rt);
    bson_destroy (&doc1_rt);
@@ -1169,10 +1165,7 @@ typedef struct {
    bson_t agg_reply;
 } resume_ctx_t;
 
-#define RESUME_INITIALIZER           \
-   {                                 \
-      false, false, BSON_INITIALIZER \
-   }
+#define RESUME_INITIALIZER {false, false, BSON_INITIALIZER}
 
 static void
 _resume_at_optime_started (const mongoc_apm_command_started_t *event)