* enable proxy setting with authentication
* don't get proxy info from /etc/sysconfig/proxy ever
* kill processes inside chroot after post script running
+ * reload device mapper using 'dmsetup' utility
* bug fix:
- fix bootloader options omitted
- - raise when incorrectly set partition flags 'legacy_boot'
+ - warn failed boot partition flags set
- fix wrong file descriptor issue
- fix some requires