Revert "turn to weight policy"

This reverts commit 11977cd90412e14a03e719d2828f6f89618b58d1.
Revert "Revert "turn to weight policy""

This reverts commit 9a43e9bae910f0b56c1fe7bed87c08974bd23427.
增加default_password
Merge branch 'master' of https://github.com/jingdong-app-engine/vcap