devicemanager/lvm: Ask lvm not to clear newly created volume

On non-alpine images, Due to some race conditions lvcreate fails to clear the
newly created block device as the result, volume creation fails.

https://linux-lvm.redhat.narkive.com/9Pu8Wro2/lvcreate-device-not-cleared-aborting-failed-to-wipe-start-of-new-lv

As we explicitly clearing the device in our code, we need not depend on lvm's
device clearing, hence this change ask's lvcreate not to zero the device.

pkg/pmem-device-manager/pmd-lvm.go

@@ -110,8 +110,10 @@ func (lvm *pmemLvm) CreateDevice(name string, size uint64, nsmode string) error
 
 	for _, vg := range vgs {
 		if vg.free >= size {
+			// In some container environments clearing device fails with race condition.
+			// So, we ask lvm not to clear(-Zn) the newly created device, instead we do ourself in later stage.
 			// lvcreate takes size in MBytes if no unit
-			if _, err := pmemexec.RunCommand("lvcreate", "-L", strSz, "-n", name, vg.name); err != nil {
+			if _, err := pmemexec.RunCommand("lvcreate", "-Zn", "-L", strSz, "-n", name, vg.name); err != nil {
 				glog.V(3).Infof("lvcreate failed with error: %v, trying for next free region", err)
 			} else {
 				// clear start of device to avoid old data being recognized as file system