test: shutdown extra non "seed" nodes after tests they're created in
test: shutdown extra non "seed" nodes after tests they're created in

This commit ensures that any extra nodes that were created as part of
the integration tests are shutdown at the end of the test after it
completes successfully. This should speed up the tests as we’ll no
longer have lingering nodes in the background of the test consuming
resources.

bryanvu/lnd,AndrewSamokhvalov/lnd,LightningNetwork/lnd,aakselrod/lnd,bryanvu/lnd,LightningNetwork/lnd,aakselrod/lnd,ddustin/lnd,AndrewSamokhvalov/lnd,ddustin/lnd