Install RHEV-H failed via booting from usb.

Build:
RHEV-H 6.1-10

Test steps:
1. Boot from usb.
2. Install rhevh 6.1-10.

Actual result:
  RHEV Hypervisor Installation Failed      

 Check /var/log/ovirt.log for more details  

   <Abort>   <Drop To Shell>      

Expected result:
  When booting from usb, RHEVH can install successful without error messages.

Note:
1.make the usb bootloader
#livecd-iso-to-disk --format --reset-mbr rhev-hypervisor-6.1-10.iso /dev/sdc
2.# df -T
Filesystem    Type   1K-blocks      Used Available Use% Mounted on
/dev/root     ext2     1032088    266104    755512  27% /
tmpfs        tmpfs     3884232         0   3884232   0% /dev/shm
/dev/mapper/HostVG-Config
              ext3        7931      1081      6441  15% /config
/dev/mapper/HostVG-Logging
              ext3     2064208     69028   1890324   4% /var/log
/dev/mapper/HostVG-Data
              ext3   470199720    202876 446112044   1% /data
/dev/mapper/1ATA     ST3500418AS                                         5VM6E5SMp2
              ext2      241965      2066    227407   1% /liveos
/dev/sdb1     vfat     3911156    114468   3796688   3% /live

3. This bug can not be reproduced when booting from CDROM or PXE
          
*************ovirt.log**************************

/dev/sdb

Saving parameters

Removing old LVM partitions

Unmounting log partition

Removing HostVG

File descriptor 3 (pipe:[25889]) leaked on vgremove invocation. Parent PID 8072:sh

File descriptor 4 (pipe:[27118]) leaked on vgremove invocation. Parent PID 8072:sh

File descriptor 7 (/tmp/ffiVX2Z8n (deleted)) leaked on vgremove invocation. Parent PID 8072: sh

  Volume group "HostVG" not found

File descriptor 3 (pipe:[25889]) leaked on vgremove invocation. Parent PID 8188:sh

File descriptor 4 (pipe:[27118]) leaked on vgremove invocation. Parent PID 8188:sh

File descriptor 7 (/tmp/ffiVX2Z8n (deleted)) leaked on vgremove invocation. Parent PID 8188: sh

  Volume group "HostVG" not found

Partitioning root drive: /dev/mapper/1ATA     ST3500418AS5VM6E5SM

Wiping old boot sector:Q$
Mounting config partition

File persisted



Successfully persisted: /etc/fstab

Mounting log partition

Mounting data partition

Completed!

File persisted



Successfully persisted: /etc/shadow

/etc/shadow

File already persisted: /etc/shadow


WARNING: persistent config storage not available


installing the image.

grub_dev_label: RootBackup

partN: 2

e2label "/dev/mapper/1ATA     ST3500418AS

  5VM6E5SMp2" RootNew

0kernel image copy failed.


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