Removed sudo from SH script. Added to instructions.

Author: uc-msft

samples/features/sql-big-data-cluster/deployment/kubeadm/ubuntu/setup-k8s-prereqs.sh

@@ -2,10 +2,9 @@
 
 # Setup the kubernetes preprequisites
 #
-sudo -i
 echo $(hostname -i) $(hostname) >> /etc/hosts
-sed -i "/ swap / s/^/#/" /etc/fstab
-swapoff -a
+sudo sed -i "/ swap / s/^/#/" /etc/fstab
+sudo swapoff -a
 curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
 cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
 deb http://apt.kubernetes.io/ kubernetes-xenial main