Unhandled exception in list_replicas
Motivation
----------
Traceback :

```
[Tue Feb 20 23:32:25.701947 2018] [:error] [pid 5431:tid 139990096934656] Traceback (most recent call last):
[Tue Feb 20 23:32:25.701980 2018] [:error] [pid 5431:tid 139990096934656]   File "/usr/lib/python2.7/site-packages/rucio/core/replica.py", line 752, in _list_replicas
[Tue Feb 20 23:32:25.701984 2018] [:error] [pid 5431:tid 139990096934656]     domain=domain)['scheme'])
[Tue Feb 20 23:32:25.701986 2018] [:error] [pid 5431:tid 139990096934656]   File "/usr/lib/python2.7/site-packages/rucio/rse/rsemanager.py", line 126, in select_protocol
[Tue Feb 20 23:32:25.701989 2018] [:error] [pid 5431:tid 139990096934656]     candidates = _get_possible_protocols(rse_settings, operation, scheme, domain)
[Tue Feb 20 23:32:25.701991 2018] [:error] [pid 5431:tid 139990096934656]   File "/usr/lib/python2.7/site-packages/rucio/rse/rsemanager.py", line 102, in _get_possible_protocols
[Tue Feb 20 23:32:25.701994 2018] [:error] [pid 5431:tid 139990096934656]     ' found : %s.' % str(rse_settings))
[Tue Feb 20 23:32:25.701996 2018] [:error] [pid 5431:tid 139990096934656] RSEProtocolNotSupported: RSE does not support requested protocol.
```

Modification
------------
Need to catch RSEProtocolNotSupported exception

diff --git a/lib/rucio/core/replica.py b/lib/rucio/core/replica.py
index 1bdd141af..6b805e5af 100644
--- a/lib/rucio/core/replica.py
+++ b/lib/rucio/core/replica.py
@@ -868,6 +868,8 @@ def _list_replicas(dataset_clause, file_clause, state_clause, show_pfns,
                                 rse_schemes.append(rsemgr.select_protocol(rse_settings=rse_info[rse],
                                                                           operation='read',
                                                                           domain=domain)['scheme'])
+                        except exception.RSEProtocolNotSupported:
+                            pass  # no need to be verbose
                         except Exception:
                             print(format_exc())
 
['lib/rucio/core/replica.py']