AWS: delete EBS volumes along with VMs

[vinseon]

In AWSEC2JCloudsProvider, when we create a new Instance we do not provide any information about the EBS volume that will be attached to the new VM. Therefore, by default, JClouds creates a gp2 volume (regular SSD) with the same size than the source image.
According to Amazon, when a new EBS volume is created, the flag deleteOnTermination is set to true but it seems that it is not the default behavior of JClouds.
The VM's template must therefore be cutomized with specific volume informations, see the method mapNewVolumeToDeviceName for instance.
Without this fix we will continue to pay for the remaining volumes after VMs deletion!