fix: add support for block 5k,15k in k8s pool and update_pool method

[lerminou]

1-
New block storage low latencies 5k and 15k are not present in the options.

• sbs_5k
• sbs_15k

the old block storage is not more available in the console but still available in the API.

2-
A new parameter is also mandatory in your API:

An exception occurred during task execution. To see the full traceback, use -vvv.     
The error was: TypeError: K8SV1API.create_pool() missing 1 required keyword-only argument: 'public_ip_disabled'

3-
And then, actually, we cannot update an existing pool.
I add the new method update_pool if we fill the pool_id, if the name is filled, then we create

Python scaleway library is version 2.7.0