test: avoid race conditions in integration test when run in travis
test: avoid race conditions in integration test when run in travis

As they can be run in multiple environments in parallel

algolia/algoliasearch-client-javascript,leohmoraes/algoliasearch-client-js,Acidburn0zzz/algoliasearch-client-js,algolia/algoliasearch-client-js,Acidburn0zzz/algoliasearch-client-js,Acidburn0zzz/algoliasearch-client-js,algolia/algoliasearch-client-javascript,MenZil/algoliasearch-client-js,algolia/algoliasearch-client-javascript,leohmoraes/algoliasearch-client-js,algolia/algoliasearch-client-js,2947721120/algoliasearch-client-js,2947721120/algoliasearch-client-js,algolia/algoliasearch-client-javascript,2947721120/algoliasearch-client-js,leohmoraes/algoliasearch-client-js,algolia/algoliasearch-client-js,MenZil/algoliasearch-client-js,MenZil/algoliasearch-client-js