ACI Private_Key String to Allow for Vaulting (#54251)

* Allows the use of Private_Keys to be entered as a string instead of just a file. Making it possible to use VAULT to encrypt the key

* Fixed Issues auto check found

* Provide helpful information while avoiding credential exposure

* Restore original variable name :-)

* Fix a few other things

* Influence the default certificate_name in both cases

* Update documentation

* Add contributed docs

* Fix CI issue

lib/ansible/plugins/doc_fragments/aci.py

@@ -34,16 +34,17 @@ options:
     required: yes
   private_key:
     description:
-    - PEM formatted file that contains your private key to be used for signature-based authentication.
-    - The name of the key (without extension) is used as the certificate name in ACI, unless C(certificate_name) is specified.
+    - Either a PEM-formatted private key file or the private key content used for signature-based authentication.
+    - This value also influences the default C(certificate_name) that is used.
     - This option is mutual exclusive with C(password). If C(password) is provided too, it will be ignored.
-    type: path
+    type: str
     required: yes
     aliases: [ cert_key ]
   certificate_name:
     description:
     - The X.509 certificate name attached to the APIC AAA user used for signature-based authentication.
-    - It defaults to the C(private_key) basename, without extension.
+    - If a C(private_key) filename was provided, this defaults to the C(private_key) basename, without extension.
+    - If PEM-formatted content was provided for C(private_key), this defaults to the C(username) value.
     type: str
     aliases: [ cert_name ]
   output_level: