build: use connect web server instead of SimpleHTTPServer

Several flakes on CI have been tied to long running SimpleHTTPServer that was
put in place temporarily after the package splitup.

scripts/ci-lite/test_e2e.sh

@@ -24,7 +24,7 @@ echo 'travis_fold:end:test.buildPackages'
 
 echo 'travis_fold:start:test.e2e.localChrome'
 cd dist/
-python -m SimpleHTTPServer 7777 &
+$(npm bin)/gulp serve &
 cd ..
 if [[ ${TRAVIS} ]]; then
   sh -e /etc/init.d/xvfb start