Revert "connect to member0"

This reverts commit 006916c8a7edf1d788a05a998f494486a5aed6fc.
Revert "pass an empty replset option"

This reverts commit 0fedbbb3944796843052d0749d68f41b87a39442.
Revert "mongodb 2.0.3"

This reverts commit 84f3db9b78cfbc40e9d8fd43cacd90b0a16ba21b.