remove unused hostname variable
remove unused hostname variable

nylas/sync-engine,Eagles2F/sync-engine,closeio/nylas,closeio/nylas,ErinCall/sync-engine,ErinCall/sync-engine,jobscore/sync-engine,Eagles2F/sync-engine,ErinCall/sync-engine,nylas/sync-engine,closeio/nylas,gale320/sync-engine,Eagles2F/sync-engine,nylas/sync-engine,gale320/sync-engine,gale320/sync-engine,gale320/sync-engine,jobscore/sync-engine,ErinCall/sync-engine,closeio/nylas,jobscore/sync-engine,Eagles2F/sync-engine,ErinCall/sync-engine,jobscore/sync-engine,Eagles2F/sync-engine,gale320/sync-engine,nylas/sync-engine