* Allow template files to be vaulted
* Make sure to import exceptions we need
* get_real_file can't take bytes, since it looks specifically for string_types
* Now that we aren't using open() we don't need b_source
* Expand playbooks_vault docs to include modules that support vaulted src files
* Add vaulted template test
* Fix vault reading from stdin (avoid realpath() on non-links)
os.path.realpath() is used to find the target of file paths that
are symlinks so vault operations happen directly on the target.
However, in addition to resolving symlinks, realpath() also returns
a full path. when reading from stdin, vault cli uses '-' as a special
file path so VaultEditor() will replace with stdin.
realpath() was expanding '-' with the CWD to something like
'/home/user/playbooks/-' causing errors like:
ERROR! [Errno 2] No such file or directory: u'/home/user/ansible/-'
Fix is to specialcase '-' to not use realpath()
Fixes#23567
* to_text decrypt output when writing to stdout
