Add ca_path option for 802.1x connections

Special notes:
Hash the cacert in the ca_path as OpenSSL needs symlinks for ca
certificates from their symlinks to their filename if specifying a
directory.

In case ieee802_1x.ca_path is specified but not supported by
NetworkManager, fail to ensure the setting is not silently ignored.

References:
https://stackoverflow.com/questions/25889341/what-is-the-equivalent-of-unix-c-rehash-command-script-on-linux
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues/448

Co-authored-by: Till Maas <opensource@till.name>

module_utils/network_lsr/argument_validator.py

@@ -871,12 +871,21 @@ class ArgValidator_Dict802_1X(ArgValidatorDict):
                 ),
                 ArgValidatorPath("client_cert", required=True),
                 ArgValidatorPath("ca_cert"),
+                ArgValidatorPath("ca_path"),
                 ArgValidatorBool("system_ca_certs", default_value=False),
                 ArgValidatorStr("domain_suffix_match", required=False),
             ],
             default_value=None,
         )
 
+    def _validate_post(self, value, name, result):
+        if result["system_ca_certs"] is True and result["ca_path"] is not None:
+            raise ValidationError(
+                name,
+                "ca_path will be ignored by NetworkManager if system_ca_certs is used",
+            )
+        return result
+
 
 class ArgValidator_DictConnection(ArgValidatorDict):