ci(aio): build aio-builds-setup scripts before pre-verifying PR

(Coincidentally), this wasn't an issue before fdfeaaf1f, because
pre-verification was run after `test.sh`, during which `aio-builds-setup` was
built.
Now that `deploy-staging.sh` is being run before `test.sh`, we need to build
the `aio-builds-setup` scripts first.

scripts/ci/test-e2e.sh

@@ -14,12 +14,6 @@ travisFoldStart "test.e2e.buildPackages"
 travisFoldEnd "test.e2e.buildPackages"
 
 
-if [[ ${TRAVIS:-} ]]; then
-  travisFoldStart "test.e2e.xvfb-start"
-    sh -e /etc/init.d/xvfb start
-  travisFoldEnd "test.e2e.xvfb-start"
-fi
-
 travisFoldStart "test.e2e.publicApi"
   $(npm bin)/gulp public-api:enforce
 travisFoldEnd "test.e2e.publicApi"