Optimise startup time

[xpillons]

VM allocation and start is now taking less than 60 seconds, however node configuration can takes 3 mn, This need to be tuned. Check the log files in /opt/cycle/jetpack/logs for timings

Cloud.AwaitBootup	Completed	0.05s
Cloud.AwaitInstallation	Completed	4m 41s
Azure.CreateResourceGroup	Completed	0.06s
Azure.AllocateNodes	Completed	1m 8s
Cloud.ValidateNodes	Completed	0.08s
Azure.InitializeNodes	Completed	0.04s
Cloud.StageResources	Completed	9.1s
Azure.AssignResourceGroups	Completed	0.07s