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##### SUMMARY
<!--- Describe the new feature/improvement briefly below -->
Add support for `MaxInstanceLifetime` option to AWS ec2_asg module.
AWS feature introduction link: https://aws.amazon.com/about-aws/whats-new/2019/11/amazon-ec2-auto-scaling-supports-max-instance-lifetime/

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
ec2_asg

##### ADDITIONAL INFORMATION
<!--- Describe how the feature would be used, why it is needed and what it would solve -->
Usage example:
<!--- Paste example playbooks or commands between quotes below -->
```yaml
- ec2_asg:
    name: myasg
    region: us-east-1
    launch_config_name: my_new_lc
    min_size: 1
    max_size: 5
    desired_capacity: 3
    max_instance_lifetime: 604800  # seconds
```

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if num_new_inst_needed == 0:
        decrement_capacity = True
        if as_group['MinSize'] != min_size:
            if min_size is None:
                min_size = as_group['MinSize']
            updated_params = dict(AutoScalingGroupName=as_group['AutoScalingGroupName'], MinSize=min_size)
            update_asg(connection, **updated_params)
            module.debug("Updating minimum size back to original of %s" % min_size)
        
        
        if leftovers:
            decrement_capacity = False
        break_loop = True
        instances_to_terminate = old_instances
        desired_size = min_size
        module.debug("No new instances needed")
    if num_new_inst_needed < batch_size and num_new_inst_needed != 0:
        instances_to_terminate = instances_to_terminate[:num_new_inst_needed]
        decrement_capacity = False
        break_loop = False
        module.debug("%s new instances needed" % num_new_inst_needed)
    module.debug("decrementing capacity: %s" % decrement_capacity)
    for instance_id in instances_to_terminate:
        elb_dreg(connection, group_name, instance_id)
        module.debug("terminating instance: %s" % instance_id)
        terminate_asg_instance(connection, instance_id, decrement_capacity)
    
    
    return break_loop, desired_size, instances_to_terminate
def wait_for_term_inst(connection, term_instances):