* ACI: Implement aci.boolean() to return an ACI boolean
A boolean value in ACI is not always standardized to yes/no.
Sometimes we have active/inactive, or enabled/disabled
Whereas the interface we want is a true YAML boolean.
We did not modify enabled/disabled values at this time.
I first want to determine if this implementation is acceptable.
* Support enabled/disabled as well, with deprecation messages
* Fix typo
* Fix PEP8 issue
* Ensure the aci object exists before using it
* Add comment to ensure this gets fixed in v2.9
* Fix typo