normalize the e2e behavior for npm link in npm 5 and below #3105
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changes in #3026 made some build fails in node 8 (success in #3104 and #3026 , failed in #2755 because of misssing dependencies). probably because npm link behavior is changed in npm 5 http://codetunnel.io/npm-5-changes-to-npm-link/
this PR tries to investigate how to normalize the npm link behavior for e2e in npm 5 and below