refactor(topology): don't explicit reset pool on SDAM unrecoverable

Author: mbroadst

lib/core/sdam/topology.js

@@ -1043,7 +1043,9 @@ function serverErrorEventHandler(server, topology) {
     }
 
     if (isSDAMUnrecoverableError(err, server)) {
-      resetServerState(server, err, { clearPool: true });
+      // NOTE: this must be commented out until we switch to the new CMAP pool because
+      //       we presently _always_ clear the pool on error.
+      resetServerState(server, err /*, { clearPool: true } */);
       return;
     }