* Protect against key and issuer name re-use
- While importing keys and issuers verify that the provided name if any has not been used by another key that we did not match against.
- Validate an assumption within the key import api, that we were provided a single key
- Add additional tests on the new key generation and key import handlers.
* Protect key import api end-users from using "default" as a name
- Do not allow end-users to provide the value of default as a name for key imports
as that would lead to weird and wonderful behaviors to the end-user.
* Add missing api-docs for PKI key import
- Validate the key_type and key_bits arguments that were provided and
perform the same default processing of 0 as we used to do for the
generateRoot/generateIntermediate apis
- Add a test that validates the behaviour
- Update the field description blurbs.
