Use credential-ID instead/in-addition of description when creating a node

[toabctl]

ISSUE TYPE

• Feature Idea

Jenkinsapi 0.3.11

Jenkins 2.164.3

SUMMARY

When creating a new node with create_node(), the node_dict expects
a parameter called credential_description. It would be nice
if also the credential ID could be given here.

[acolombier]

We are currently blocked from using jenkinsapi because of this issue.

I just created PR #798 which is supposed to fix it, please let me know if that can merge ASAP.