Configuration of token bucket size

The token bucket size is an important parameter which defines the burst tolerance of the plicer acting on premium traffic. It's default value is 2200 bytes.
According to our testing, the default size makes the policer too strict when a TCP stream is generated by some traffic generators like netperf.
Strictness depends on the average size of the packet. Netperf generates packets with average size close to the MTU, but according to the engineering with smaller packets the default token bucket size is acceptable.

The token bucket size can be modified in the following way (L.Li): You can change it in debug screen (talk 4) as follows:

go to talk 4 by entering 't 4' where you used to enter 't 5' or 't 6'
enter
```
word ds_token_bucket
```
you should see the output indicating a value of 2200.
now enter
```
word ds_token_bucket=4400
```
or whatever number you like to try. Normal rule-of-thumb is 2 to 4 times of the packet size, depending on your tolerence of burstyness.
now go to talk 5, 'feature policy', do 'reset database' to cleanup current streams. Next time the EF stream is set up, it should have the new token bucket size.

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