[INT] various updates to AKS deployment scripts

- Adding support for pluggable post-install scripts. See README.
- Adding pre_install check to validate the correct software is installed before attempting deployment.
- Updating AKS deploy command line to support azure cli 2.0.75.

Issue-ID: INT-1398
Signed-off-by: stark, steven <steven.stark@att.com>
Change-Id: I1ff819e96a3f34c88580e90e8d6f2b79979a7a61
diff --git a/deployment/aks/create_aks.sh b/deployment/aks/create_aks.sh
index 23f6ae3..cd4680d 100755
--- a/deployment/aks/create_aks.sh
+++ b/deployment/aks/create_aks.sh
@@ -216,7 +216,9 @@
               --dns-service-ip "$AKS_DNS_IP" \
               --admin-username "$AKS_ADMIN_USER" \
               --ssh-key-value "$PUBLIC_KEY" \
-              --vnet-subnet-id "$AKS_SUBNET_ID"
+              --vnet-subnet-id "$AKS_SUBNET_ID" \
+              --vm-set-type "AvailabilitySet" \
+              --load-balancer-sku "basic"
 echo ""
 
 AKS_MANAGEMENT_RESOURCE_GROUP_NAME=`az group list --query "[?starts_with(name, 'MC_${AKS_RESOURCE_GROUP_NAME}')].name | [0]" --output tsv`