wait for provision to complete before install test agent (#3094)

* wait for provision to complete

* address comments

tests_e2e/orchestrator/scripts/install-agent

@@ -85,19 +85,19 @@ echo "Agent Version:"
 $python "$waagent" --version
 echo "Service Status:"
 
-# Sometimes the service can take a while to start; give it a few minutes,
+# We need to wait for the provisioning code to complete before stopping the agent's service to do the test setup
 started=false
 for i in {1..6}
 do
-  if service-status $service_name; then
+  if [[ -f /var/lib/waagent/provisioned ]]; then
     started=true
     break
   fi
-  echo "Waiting for service to start..."
+  echo "Waiting for agent to complete provisioning."
   sleep 30
 done
 if [ $started == false ]; then
-  echo "Service failed to start."
+  echo "Provisioning did not complete within the given timeout (cannot find /var/lib/waagent/provisioned)"
   exit 1
 fi