Revert "Restore iscsi loopback LVM volume group on startup"

This reverts commit b8f15088b5c3b70ae2c12ecd8185064a0159a6e1.

The original commit failed to fully address the problem it tried
to solve, and is causing additional problems.

Closes-Bug: #1768833
Change-Id: I9126e5acaf16a39528c65e756eb475dc62e1ab40
Conflicts:
	manifests/setup_test_volume.pp

manifests/setup_test_volume.pp

@@ -59,12 +59,4 @@ class cinder::setup_test_volume(
     unless      => "vgdisplay | grep ${volume_name}",
     refreshonly => true,
   }
-
-  # Ensure the loopback device and volume group are restored if the system
-  # were to reboot.
-  -> exec { "losetup -f ${volume_path}/${volume_name} && udevadm settle && vgchange -a y ${volume_name}":
-    path   => ['/bin','/usr/bin','/sbin','/usr/sbin'],
-    unless => "losetup -l | grep ${volume_path}/${volume_name}",
-    before => Anchor['cinder::service::begin'],
-  }
 }

spec/classes/cinder_setup_test_volume_spec.rb

@@ -20,8 +20,4 @@ describe 'cinder::setup_test_volume' do
         :mode => '0640'
     )
   end
-
-  it 'should restore loopback device and volume group' do
-    is_expected.to contain_exec('losetup -f /var/lib/cinder/cinder-volumes && udevadm settle && vgchange -a y cinder-volumes')
-  end
 end