Fixed error msgs on FreeIPABaseModule subclasses

When a fail_json is called a SystemExit exeception is raised.
Since the FreeIPABaseModule has an internal context manager to deal
with exceptions this ContextManager captures the SystemExit. After
dealing destroying the kinit session the SystemExit must be raised again
to allow the fail_json to work properly.

plugins/module_utils/ansible_freeipa_module.py

@@ -610,12 +610,15 @@ class FreeIPABaseModule(AnsibleModule):
         exit the module with proper arguments.
 
         """
-        if exc_val:
-            self.fail_json(msg=str(exc_val))
-
         # TODO: shouldn't we also disconnect from api backend?
         temp_kdestroy(self.ccache_dir, self.ccache_name)
 
+        if exc_type == SystemExit:
+            raise
+
+        if exc_val:
+            self.fail_json(msg=str(exc_val))
+
         self.exit_json(changed=self.changed, user=self.exit_args)
 
     def get_command_errors(self, command, result):