T6028: Fix QoS policy shaper wrong class_id_max and default_minor_id

The `class_id_max` is wrong due to `tmp.sort` of Strings
If we have class 5 and class 10 we get sorted max value 5, expected 10

```
>>> tmp = ['5', '10']
>>> tmp.sort()
>>> tmp
['10', '5']
>>>

>>> hex(5+1)
'0x6'
>>>
>>> hex(10+1)
'0xb'
>>>
```

This way we get wrong default maximum class value:
```
tc qdisc replace dev eth1 root handle 1: htb r2q 444 default 6
```
Expect:
```
tc qdisc replace dev eth1 root handle 1: htb r2q 444 default b
```

Fix this converting Strings to Integers and get max value.

1 files changed, 3 insertions, 2 deletions

diff --git a/python/vyos/qos/trafficshaper.py b/python/vyos/qos/trafficshaper.py
index 7d580baa2..8b0333c21 100644
--- a/python/vyos/qos/trafficshaper.py
+++ b/python/vyos/qos/trafficshaper.py
@@ -29,8 +29,9 @@ class TrafficShaper(QoSBase):
         class_id_max = 0
         if 'class' in config:
             tmp = list(config['class'])
-            tmp.sort()
-            class_id_max = tmp[-1]
+            # Convert strings to integers
+            tmp = [int(x) for x in tmp]
+            class_id_max = max(tmp)
 
         r2q = 10
         # bandwidth is a mandatory CLI node