修改login_form,增加username password关键字
Revert "修改login_form,增加username password关键字"

This reverts commit 5aae2611d2dc486352c7d33a3520a8336dffc876.
Revert "Revert "修改login_form,增加username password关键字""

This reverts commit 6ea1a4299d44ccb6f114a5d53a90e26e0fd33b72.