storage: Activate/deactivate logical volumes only on local node

Current "-ay | -an" has problems on pool starting/refreshing if
the volumes are clustered. Rommer has posted a patch to list 2
months ago.

https://www.redhat.com/archives/libvir-list/2011-October/msg01116.html

But IMO we shouldn't skip the inactived vols. So this is a squashed
patch by Rommer.
Signed-off-by: NRommer <rommer@active.by>

src/storage/storage_backend_logical.c

@@ -51,7 +51,7 @@ virStorageBackendLogicalSetActive(virStoragePoolObjPtr pool,
     const char *cmdargv[4];
 
     cmdargv[0] = VGCHANGE;
-    cmdargv[1] = on ? "-ay" : "-an";
+    cmdargv[1] = on ? "-aly" : "-aln";
     cmdargv[2] = pool->def->source.name;
     cmdargv[3] = NULL;