Few things in life are sure things: Death. Taxes. Talk of Avon being up for sale. Those nattering-nabobs on Wall Street are at it again. After losing $3 billion in market value since its last known suitor walked away, observers say company executives may be williing to open their door to potential buyers. Avon’s board in March recommended shareholders vote against a proposal to limit golden parachutes for management fired in connection with a sale. That could be interpreted as a sign the board...