Add logs when cannot fit numa

When 'host_topology' can not be satified with 'requested_topology',
nova-compute returns the msg to nova-conductor but there is no logs
in nova-compute.log. So this patch adds some info log.

Closes-Bug: #1934412
Change-Id: Iff44abf002aac548340ffab0a6f85bc4906738a3

nova/compute/claims.py

@@ -112,6 +112,8 @@ class Claim(NopClaim):
                    self._test_pci()]
         reasons = [r for r in reasons if r is not None]
         if len(reasons) > 0:
+            LOG.info('Failed to claim: %s', '; '.join(reasons),
+                     instance=self.instance)
             raise exception.ComputeResourcesUnavailable(reason=
                     "; ".join(reasons))