Add new turtle test node based directly on NodeBase#353

Open

gavin-norman-sociomantic wants to merge 6 commits intosociomantic-tsunami:v6.x.xfrom

gavin-norman-sociomantic:nodeenv

Commits on Aug 23, 2018

Remove unused import
Gavin Norman
committed

Commits on Aug 24, 2018

Move construction of INodeBase's select listeners into abstract methods
Gavin Norman
committed
Add NodeBase.restartListeners
Gavin Norman
committed
Rename NodeBase.stopListener -> stopListeners
Gavin Norman
committed
Add turtle.env.model.TestNode
Gavin Norman
committed
Adapt the turtle env node test to use the new TestNode
Gavin Norman
committed