install: Move apt-get update into setup-apt-repo.

scripts/lib/install

@@ -15,9 +15,9 @@ DEPLOYMENT_TYPE="${DEPLOYMENT_TYPE:-voyager}"
 PUPPET_CLASSES="${PUPPET_CLASSES:-zulip::voyager}"
 VIRTUALENV_NEEDED="${VIRTUALENV_NEEDED:-yes}"
 
+# setup-apt-repo does an `apt-get update`
 /root/zulip/scripts/lib/setup-apt-repo
 
-apt-get update
 apt-get -y dist-upgrade $APT_OPTIONS
 apt-get install -y puppet git python python-six crudini $ADDITIONAL_PACKAGES
 

scripts/lib/setup-apt-repo

@@ -20,3 +20,5 @@ else
     echo "Unsupported release $release."
     exit 1
 fi
+
+apt-get update