Mongo scripts connect to Replica-set

Now you can directly connect to replica-set and log on to primary.

For example:

Mongo -- host rs1/vm1: 27017, vm3: 27017, vm4: 27017 db_name, and a bunch of information is displayed.

Thu Dec 12 16:44:48. 227 successfully connected to seed vm1: 27017 for replica set rs1 Thu Dec 12 16:44:48. 228 changing hosts to {0: "vm1: 27017", 1: "vm4: 27017", 2: "vm3: 27017"} from rs1/Thu Dec 12 16:44:48. 228 trying to add new host vm1: 27017 to replica set rs1 Thu Dec 12 16:44:48. 229 successfully connected to new host vm1: 27017 in replica set rs1 Thu Dec 12 16:44:48. 229 trying to add new host vm3: 27017 to replica set rs1 Thu Dec 12 16:44:48. 232 successfully connected to new host vm3: 27017 in replica set rs1 Thu Dec 12 16:44:48. 232 trying to add new host vm4: 27017 to replica set rs1 Thu Dec 12 16:44:48. 234 successfully connected to new host vm4: 27017 in replica set rs1 Thu Dec 12 16:44:48. 240 Primary for replica set rs1 changed to vm1: 27017 Thu Dec 12 16:44:48. 247 replica set monitor for replica set rs1 started, address is rs1/vm1: 27017, vm3: 27017, vm4: 27017 Thu Dec 12 16:44:48. 247 [ReplicaSetMonitorWatcher] starting