Validate template settings when T2 Unlimited has been enabled
Validate template settings when T2 Unlimited has been enabled

* T2 Unlimited cannot be used with anything other than T2 instance types
* T2 Unlimited cannot be used with Spot Instances

hashicorp/packer,timsutton/packer,tas50/packer,bryson/packer,tas50/packer,timsutton/packer,grubernaut/packer,KohlsTechnology/packer,paulmey/packer,paulmey/packer,KohlsTechnology/packer,rnaveiras/packer,grubernaut/packer,youhong316/packer,pecigonzalo/packer,dave2/packer,tas50/packer,hashicorp/packer,mitchellh/packer,timsutton/packer,mkuzmin/packer,paulmey/packer,hashicorp/packer,youhong316/packer,tas50/packer,ricardclau/packer,paulmey/packer,youhong316/packer,tb3088/packer,mitchellh/packer,grubernaut/packer,paulmey/packer,timsutton/packer,KohlsTechnology/packer,dave2/packer,dave2/packer,mitchellh/packer,bryson/packer,bryson/packer,mitchellh/packer,KohlsTechnology/packer,rnaveiras/packer,youhong316/packer,mitchellh/packer,dave2/packer,tb3088/packer,grubernaut/packer,tb3088/packer,KohlsTechnology/packer,tas50/packer,tb3088/packer,youhong316/packer,dave2/packer,mkuzmin/packer,mkuzmin/packer,dave2/packer,bryson/packer,grubernaut/packer,mkuzmin/packer,tb3088/packer,ricardclau/packer,tas50/packer,timsutton/packer,rnaveiras/packer,youhong316/packer,grubernaut/packer,ricardclau/packer,ricardclau/packer,pecigonzalo/packer,hashicorp/packer,mkuzmin/packer,timsutton/packer,bryson/packer,bryson/packer,rnaveiras/packer,ricardclau/packer,paulmey/packer,rnaveiras/packer,KohlsTechnology/packer,ricardclau/packer,mkuzmin/packer,pecigonzalo/packer,rnaveiras/packer,pecigonzalo/packer,tb3088/packer