Reduce worker nodes for PR Builder Integration Tests
Reduce worker nodes for PR Builder Integration Tests

We saw a number of errors around "Insufficient Resources" when
running 10+ nodes. We believe 8 is a safe number.

This is due to the size of the bosh-lites and because we are running a
whole integration suite.

Co-authored-by: Alex Shan <3699c52ee70da1416bddb1dd01fa92485ecb8827@pivotal.io>

cloudfoundry/cli,cloudfoundry/cli,cloudfoundry/cli