Switch to using in-tree tempest lib

As a result of change db9672e3473cd, tempest_lib is no
longer a thing we should be using.

Change-Id: I47f368fdce477d7419cc8fc23eb17264df42932d
3 files changed
tree: 9d8187f3e4af6fd5178565e3a6a467221842384f
  1. neutron/