Fix nodepool-zuul-functional

Several fixes to this job:

Use pip3 in the setup script as nodepool is v3 only; this whole script
needs to be made native, but this works for now.

Make sure we pass a list as the Node() request name

Update accpetNodes call to pass id

Change-Id: I3d064e6c1df02f1dad2a08855927703a0e23a047
2 files changed