* Fail when attempting to modify unmodifiable target group parameters
As you can't modify Port, Protocol or VPC id for a target group, fail
when this happens rather than pretending to do it.
One could argue that the target group could be recreated rather than
failing, but this has massive knock on implications to other resources
that depend on the TG (all ASGs would need to be updated, the ELB
listener would need to be updated, etc)
* Use `.get()` instead of direct dictionary access
* Addition of TCP protocol to ELB target group as target groups support HTTP/S and TCP now
* Fixup stickiness type so that it checks if the current_tg has the stickiness_type key in the dict, as TCP ones do not
* New module = elb_target_group
* Update elb_target_group.py
Adds support for adding and removing targets from a target group
* Better error handling
* Bump version_added
* Minor fixes
* Scope ec2 imports, add better doco, fix up examples, allow for both upper and lower case in protocol
* Yaml fixes
* ci fix
* Added targets parameter to doc and added new modify_targets flag to prevent runs from modifying targets
* Update to metadata_version
* Update to metadata support
* Remove defaults for some params. Add tags parameter
* Use paginator to get target groups
* Add tag support
* Add tg attributes to module
* Quote multilines
* Remove unnecessary defaults. Fix multiline
* Fix line ending
Rob
Will Thames
Prasad Katti
Marc Mercer
Javier Cortejoso
Kaz Cheng
Toshio Kuratomi
Nick Ward