Test case to reproduce "no open connections" problem observed when secondary drops out of replicaset.
Test case to reproduce "no open connections" problem observed when secondary drops out of replicaset.

mongodb/node-mongodb-native,HiLittleCat/node-mongodb-native,sarathms/node-mongodb-native,BlueRival/node-tokumx-native,mvnnn/node-mongodb-native,pakokrew/node-mongodb-native,d-mon-/node-mongodb-native,PeterWangPo/node-mongodb-native,thenaughtychild/node-mongodb-native,mongodb/node-mongodb-native,hgGeorg/node-mongodb-native,capaj/node-mongodb-native,Lapixx/node-mongodb-native,rafkhan/node-mongodb-native,zhangyaoxing/node-mongodb-native,christophehurpeau/node-mongodb-native,jqk6/node-mongodb-native,mongodb/node-mongodb-native,tuyndv/node-mongodb-native,elijah513/node-mongodb-native,Samicelus/node-mongodb-native,ystskm/node-mongodb-native,HBOCodeLabs/node-mongodb-native,mongodb/node-mongodb-native,patriksimek/node-mongodb-native,flyingfisher/node-mongodb-native,nahidcse05/node-mongodb-native,amit777/node-mongodb-native,beni55/node-mongodb-native,dnanexus/node-mongodb-native,janaipakos/node-mongodb-native,agclever/node-mongodb-native,segmentio/node-mongodb-native,BlueRival/node-tokumx-native