test: ensure OP_MSG exhaust test is only run on standalones

Author: mbroadst

test/functional/cmap/connection.test.js

@@ -77,7 +77,7 @@ describe('Connection', function() {
   });
 
   it('should support calling back multiple times on exhaust commands', {
-    metadata: { requires: { mongodb: '>=4.2.0' } },
+    metadata: { requires: { mongodb: '>=4.2.0', topology: ['single'] } },
     test: function(done) {
       const ns = `${this.configuration.db}.$cmd`;
       const connectOptions = Object.assign(