* Add new parameters to taskdefinition module - network_mode and task_role_arn
* Add version_added field for doco
* Change version_added parameter to 2.3
* Allow re-using an existing template when updating a stack by not passing 'template' or 'template_url'. This is a big one for me as our deploy process creates a new stack and then modifies the old one; to avoid changing the resources inside the old one, we have had to avoid using the Ansible module and use the AWS CLI instead in order to pass `--use-previous-template`.
* Split create and update logic into separate functions
* Remove dead `update` variable
PR move of https://github.com/ansible/ansible-modules-core/pull/3588
##### ISSUE TYPE
- Docs Pull Request
##### COMPONENT NAME
ec2_group.py
##### ANSIBLE VERSION
```
ansible 2.0.2.0
config file = /Users/tpai/src/cm-secure/ansible.cfg
configured module search path = Default w/o overrides
```
##### SUMMARY
Make it clear you can specify the created group in the rules list, allowing idempotent use for group<->group networking rules.
This is a really useful feature that isn't obvious enough in the docs.
Fixes unnecessary VM restart.
VM userdata is currently not returned by the API listVirtualMachine and task will always be marked as changed in has_changed(), which will result in an unnecessary VM restart if force=true.
Reported by @Mayeu
* Change example syntax on os_auth module
* Change example syntax on os_client_config module
* Change example syntax on os_image_facts module
* Change example syntax on os_networks_facts module
* Change example syntax on os_nova_flavor module
* Change example syntax on os_object module
* Change example syntax on os_server module
* Change example syntax on os_subnet_facts module
* Change example syntax on rax_files module
* Change example syntax on rax_files_objects module
* Change example syntax on mysql_db module
* Change example syntax on file module
* Change example syntax on uri module
* Change example syntax on cl_bond module
* Change example syntax on cl_bridge module
* Change example syntax on cl_img_install module
* Change example syntax on cl_interface module
* Change example syntax on cl_license module
* Change example syntax on cl_ports module
* Remove trailing colon
I broke backwards compat with the addition to define when a password
should be updated. It was requiring that a password value be passed when
deleting a user, which seems silly.
This moves the argument logic out of the argument spec and into when it
would be needed, when state is present.
