Description of problem:
Trying to install a system with iSCSI boot causes the following error


Progress
Setting up the installation environment
.
** (anaconda:1373): WARNING **: Could not open X display
An unknown error has occured, look at the /tmp/anaconda-tb* file(s) for more details

===============================================================================
An unknown error has occurred
===============================================================================
anaconda 19.31.32-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python2.7/site-packages/blivet/devicelibs/lvm.py", line 439, in lvactivate
    raise LVMError("lvactivate failed for %s: %s" % (lv_name, msg))
  File "/usr/lib/python2.7/site-packages/blivet/devices.py", line 2684, in _setup
    lvm.lvactivate(self.vg.name, self._name)
  File "/usr/lib/python2.7/site-packages/blivet/devices.py", line 718, in setup
    self._setup(orig=orig)
  File "/usr/lib/python2.7/site-packages/blivet/deviceaction.py", line 526, in execute
    self.device.setup(orig=True)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 237, in processActions
    action.execute()
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 306, in doIt
    self.devicetree.processActions()
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 170, in turnOnFilesystems
    storage.doIt()
  File "/usr/lib64/python2.7/site-packages/pyanaconda/install.py", line 144, in doInstall
    turnOnFilesystems(storage, mountOnly=flags.flags.dirInstall)
  File "/usr/lib64/python2.7/threading.py", line 764, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/threads.py", line 168, in run
    threading.Thread.run(self, *args, **kwargs)
LVMError: lvactivate failed for lv_root: running lvm lvchange -a y --config  devices { filter=["r|/360a980003246694a412b424f41657a35$|","r|/sdb$|","r|/sdd$|"] }  vg_storageqe02/lv_root failed

Version-Release number of selected component (if applicable):
anaconda 19.31.32-1

How reproducible:
100%

Steps to Reproduce:
1. Try to install RHEL7 on iSCSI boot device