metadata: format: also delete bootloader areas from lvmcache when reading lvm1 and pool label

lvm1 and pool format do not support bootloader areas and we need to
remove any existing associated bootloader areas when we read lvm1 and
pool labels.

This has its importance if we're converting from one format to another
and we're reusing lvmcache in long-running commands (e.g. clvmd or lvm
shell) and we need to make lvmcache consistent and valid for current format.

lib/format1/lvm1-label.c

@@ -81,6 +81,7 @@ static int _lvm1_read(struct labeller *l, struct device *dev, void *buf,
 
 	lvmcache_set_device_size(info, ((uint64_t)xlate32(pvd->pv_size)) << SECTOR_SHIFT);
 	lvmcache_del_mdas(info);
+	lvmcache_del_bas(info);
 	lvmcache_make_valid(info);
 
 	return 1;

lib/format_pool/disk_rep.c

@@ -105,6 +105,7 @@ int read_pool_label(struct pool_list *pl, struct labeller *l,
 
 	lvmcache_set_device_size(info, ((uint64_t)xlate32_be(pd->pl_blocks)) << SECTOR_SHIFT);
 	lvmcache_del_mdas(info);
+	lvmcache_del_bas(info);
 	lvmcache_make_valid(info);
 
 	pl->dev = dev;