Revert "follow symlinks while discovering valid playbooks"

This reverts commit 3dd21d720e.

awx/main/utils/ansible.py

@@ -64,7 +64,6 @@ def could_be_playbook(project_path, dir_path, filename):
                 matched = True
                 break
     except IOError:
-        logger.exception(f'failed to open {playbook_path}')
         return None
     if not matched:
         return None