Fix module-list failing with AccessInfoV2 error

Due to recent changes (not sure what) the trove module-list command
now fails while trying to determine if the client is being run as
an admin user.

The error looks like the following:

 DEBUG (shell:752) 'AccessInfoV2' object has no attribute '__getitem__'
 Traceback (most recent call last):
   File "/opt/python-troveclient/python-troveclient/troveclient/shell.py",
     line 747, in main sys.argv[1:]))
   File "/opt/python-troveclient/python-troveclient/troveclient/shell.py",
     line 562, in main args.func(self.cs, args)
   File "/opt/python-troveclient/python-troveclient/troveclient/v1/shell.py",
     line 1552, in do_module_list
        roles = cs.client.auth.auth_ref['user']['roles']
   TypeError: 'AccessInfoV2' object has no attribute '__getitem__'
   ERROR: 'AccessInfoV2' object has no attribute '__getitem__'

The code was changed so that it doesn't fail even if the structure
of the access object changes.

Change-Id: Ib0a7de0b8df359c9ad5a582bbe7afcff56d332f8
Closes-Bug: #1607428

troveclient/v1/shell.py

@@ -1548,10 +1548,17 @@ def do_module_list(cs, args):
     field_list = ['id', 'name', 'type', 'datastore',
                   'datastore_version', 'auto_apply', 'tenant', 'visible']
     is_admin = False
-    if hasattr(cs.client, 'auth'):
-        roles = cs.client.auth.auth_ref['user']['roles']
+    try:
+        try:
+            roles = cs.client.auth.auth_ref['user']['roles']
+        except TypeError:
+            roles = cs.client.auth.auth_ref._data['access']['user']['roles']
         role_names = [role['name'] for role in roles]
         is_admin = 'admin' in role_names
+    except TypeError:
+        pass
+    except AttributeError:
+        pass
     if not is_admin:
         field_list = field_list[:-2]
     utils.print_list(