T5963: Fix QoS shaper rate calculations and set defaul 1Gbit

It is impossible to detect interface speed for some devices
for exmaple virtio interfaces:
```
vyos@r4:~$ cat /sys/class/net/eth1/speed
-1
```

It causes wrong negative calcultaions like:
 - bandwidth: -1000000
 - 4% of bandwidth: -40000

tc class replace dev eth1 parent 1: classid 1:1 htb rate -1000000
tc class replace dev eth1 parent 1:1 classid 1:a htb rate -40000

Fix this with checking negative value.
Add default interface speed to 1000 Mbit if we cannot detect the
interface speed, the current default value 10 Mbit is too low
for nowadays

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