* stabilize ec2_vpc_subnet module
* Add waiters for ec2_vpc_subnet
Clean up integration tests
* Reenable CI for stabilized ec2_vpc_subnet tests
* rename waiters
* Use module_json_aws where applicable
Handle WaiterError first if waiting failed
* Fix traceback when tagging with keys/values that look like booleans
* Fix check mode with tags
* Add integration tests for tags that look like booleans and check mode
* Add waiter for deleting subnet
* Sleep a few seconds after using aws command line
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