updated deployment script (#937)

* separate SP creation

separated Service Principal creation of aks due to issues on some machines with integrated SP creation
fixed typo in README

* Update deploy-sql-big-data-aks.py

removed JSON output

* adjusted for CU5

* change back

* update to CU5

* Updated requirements for pyspark installation in CU5

* Update setup-bdc.sh

* Update setup-bdc.sh

* Revert "Update setup-bdc.sh"

This reverts commit de66fa66aa.

* Revert "Update setup-bdc.sh"

This reverts commit 22fb8c17ad.

* Update setup-bdc.sh

samples/features/sql-big-data-cluster/deployment/kubeadm/ubuntu-single-node-vm/setup-bdc.sh

@@ -34,8 +34,8 @@ export DEBIAN_FRONTEND=noninteractive
 
 # Kube version.
 #
-KUBE_DPKG_VERSION=1.16.3-00
-KUBE_VERSION=1.16.3
+KUBE_DPKG_VERSION=1.18.3-00
+KUBE_VERSION=1.18.3
 
 # Wait for 5 minutes for the cluster to be ready.
 #
@@ -205,7 +205,7 @@ apt-get install -q -y kubelet=$KUBE_DPKG_VERSION kubeadm=$KUBE_DPKG_VERSION kube
 # Holding the version of kube packages.
 #
 apt-mark hold kubelet kubeadm kubectl
-curl https://raw.githubusercontent.com/kubernetes/helm/master/scripts/get | bash
+curl https://raw.githubusercontent.com/kubernetes/helm/master/scripts/get-helm-3 | bash
 
 . /etc/os-release
 if [ "$UBUNTU_CODENAME" == "bionic" ]; then