* Create ASG tags via for - utility from terraform 12
* Updated support for mixed ASG in worker_groups_launch_template variable
* Updated launch_template example to include spot and mixed ASG with worker_groups_launch_template variable
* Removed old config
* Removed workers_launch_template_mixed.tf file, added support for mixed/spot in workers_launch_template variable
* Updated examples/spot_instances/main.tf with Mixed Spot and ondemand instances
* Removed launch_template_mixed from relevant files
* Updated README.md file
* Removed workers_launch_template.tf.bkp
* Fixed case with null on_demand_allocation_strategy and Spot allocation
* Fixed workers_launch_template.tf, covered spot instances via Launch Template
