CA-413899: Rescan LVs whilst activating

There is a small window where, if a VM is leaf coalesced whilst it is
shutdown, that a subsequent atempt to activate the VDI will fail with
`SR_BACKEND_FAILURE_46 (The VDI is not available)`. This appears to be
due to the GC process not issuing a `_updateSlavesOnRename` request
because the VDI is not active. To avoid this ensure that the
`--refresh` is performed when attempting to attach/activate.

Signed-off-by: Mark Syms <mark.syms@cloud.com>

Author: MarkSymsCtx

libs/sm/lvmcache.py

@@ -144,7 +144,7 @@ def activate(self, ns, ref, lvName, binary):
             count = RefCounter.get(ref, binary, ns)
             if count == 1:
                 try:
-                    self.activateNoRefcount(lvName)
+                    self.activateNoRefcount(lvName, True)
                 except util.CommandException:
                     RefCounter.put(ref, binary, ns)
                     raise