Bug 598932

Description of problem:
I meet rhevh uggrade fail after doing dirty install.  

Version-Release number of selected component (if applicable):
rhev-hypervisor-5.5-2.2.3

How reproducible:
Always

Steps to Reproduce::
1.Make sure you have installed rhevh into FC (multipath:/dev/sdv)
2.Do dirty install into USB storage  without uninstall (USB: /dev/sdap)
3.After USB installation, register to rhevm, do upgrading. Then you can see this upgrade will fail.

check label, it will symlink to FC /dev/sdv, not usb
[root@amd-1352-8-4 ~]# ll /dev/disk/by-label
total 0
lrwxrwxrwx 1 root root 10 Jun  2 07:44 BOOT -> ../../sdv

[root@amd-1352-8-4 ~]# multipath -ll -v2 | grep sdv -A4 -C4
3600a0b80005adb0b000045794b95a91c dm-5 IBM,1726-4xx  FAStT
[size=55G][features=1 queue_if_no_path][hwhandler=1 rdac][rw]
\_ round-robin 0 [prio=200][active]
 \_ 0:0:3:0 sdl  8:176  [active][ready]
 \_ 3:0:2:0 sdv  65:80  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 3:0:3:0 sdaf 65:240 [active][ghost]
 \_ 0:0:1:0 sdb  8:16   [active][ghost]
SATA_WDC_WD2502ABYS-_WD-WCAT19593718 dm-20 ATA,WDC WD2502ABYS-1

[root@amd-1352-8-4 ~]# e2label /dev/sdv1
BOOT
[root@amd-1352-8-4 ~]# e2label /dev/sdap1
BOOT
  
Actual results:
Upgrade will fail , and you can see label is symlink to FC, not the USB

Expected results:
Upgrade will success, and label is symlink to USB


Additional info: