Wrong POST /credentials parameter in SwaggerUI

[lorthirk]

Describe the bug
In SwaggerUI, the POST /credential API proposes a wrong name for one of the body fields (credentialPlainKey instead of credentialKey)

To Reproduce
Steps to reproduce the behavior:

1. Go to SwaggerUI
2. Open POST /credential
3. Check the parameters in the model schema
4. See that there's no credentialKey, but there's s credentialPlainKey instead

Expected behavior
The correct field name is credentialKey

Screenshots

Version of Kapua
1.0.0

Type of deployment
[x] Local Vagrant deployment
[x] Docker
[x] Openshift (in its variants)
[x] Others

Main component affected
[ ] Console (in case of console please report info on which browser you encountered the problem)
[x] REST API
[ ] Message Broker
[ ] - Others

Additional context
N/A