Do not install ntp with cosmos script

This is handled with sunet::server

global/pre-tasks.d/020common-tools

@@ -8,7 +8,7 @@ set -e
 stamp="$COSMOS_BASE/stamps/common-tools-v01.stamp"
 
 if ! test -f $stamp; then
-    apt-get -y install vim traceroute tcpdump molly-guard less rsync git-core unattended-upgrades ntp
+    apt-get -y install vim traceroute tcpdump molly-guard less rsync git-core unattended-upgrades
     update-alternatives --set editor /usr/bin/vim.basic
 
     mkdir -p `dirname $stamp`