CoreOS etcd sync check

coreos-etcd-sync-check

etcd_sync_check(){
  count=0;
  while ( true ); do
    check=$(etcdctl ls / | grep 'Cannot sync' | wc -l) ;
    if [ $check -eq 0 ]; then
      break ;
    else
      warning "Cannot connect to etcd"
      if [ $count -gt 50 ]; then
        fatal "Failed to connect to etcd"
      fi
    fi ;
    sleep 10 ;
  done ;
}