Add node 8.16.1, remove node 8.15.1
Add node 8.16.1, remove node 8.15.1

for stack(s) cflinuxfs2, cflinuxfs3 [#167934806]

cloudfoundry/nodejs-buildpack,cloudfoundry/nodejs-buildpack,cloudfoundry/nodejs-buildpack,cloudfoundry/nodejs-buildpack