    database/sql: Alter *DB.begin to return driver.ErrBadConn when driver.Conn.Begin returns driver.ErrBadConn Fixes issue 4433
    database/sql: Alter *DB.begin to return driver.ErrBadConn when driver.Conn.Begin returns driver.ErrBadConn
Fixes issue 4433

R=golang-dev, bradfitz
CC=golang-dev
https://codereview.appspot.com/6845094

Committer: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

wesolows/golang,wesolows/golang,wesolows/golang-old,wesolows/golang-old,wesolows/golang,firebitsbr/golang-old,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang,firebitsbr/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang,wesolows/golang-old,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,wesolows/golang-old