Set bootable flag for volume serializer

In previous code we didn't set the bootable flag in volume
serializer, and even didn't check it in test. This is the
root cause for bug #1207155

This patch fixed this issue by set the bootable flag in serializer.

Fixed bug #1207155

Change-Id: I0219785aa7f30036747c230800447e99c383042c
Merge "Set bootable flag for volume serializer"