mbox: strip the angle brackets from message id

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
mbox: make mid parsing more robust

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Fix outdated patches apply documentation

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
apply: give better error messages when applying a broken series

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>