emulate/traffic: add sAMAccountName in create_group

While using script/traffic_replay to generate users and groups, we get
autogenerated group name like:

    $2A6F42B2-39FAF4556E2BE379

This patch specify sAMAccountName to overwriten the name.

Signed-off-by: Joe Guo <joeg@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>

python/samba/emulate/traffic.py

@@ -1708,6 +1708,7 @@ def create_group(ldb, instance_id, name):
     ldb.add({
         "dn": dn,
         "objectclass": "group",
+        "sAMAccountName": name,
     })
     end = time.time()
     duration = end - start