refactor(libtofs): remove deprecated v1_path_prefix argument

* Unused throughout all SaltStack Formulas

template/libtofs.jinja

@@ -2,7 +2,6 @@
  lookup=None,
  default_files_switch=['id', 'os_family'],
  indent_width=6,
- v1_path_prefix='',
  use_subpath=False) %}
  {#-
  Returns a valid value for the "source" parameter of a "file.managed"
@@ -18,8 +17,6 @@
  use as selector switch of the directories under
  "<path_prefix>/files"
  * indent_witdh: indentation of the result value to conform to YAML
- * v1_path_prefix: (deprecated) only used for injecting a path prefix into
- the source, to support older TOFS configs
  * use_subpath: defaults to `False` but if set, lookup the source file
  recursively from the current state directory up to `tplroot`
 
@@ -67,9 +64,7 @@
  {%- set src_files = src_files + source_files %}
  {#- Only add to [''] when supporting older TOFS implementations #}
  {%- set path_prefix_exts = [''] %}
- {%- if v1_path_prefix != '' %}
- {%- do path_prefix_exts.append(v1_path_prefix) %}
- {%- elif use_subpath and tplroot != tpldir %}
+ {%- if use_subpath and tplroot != tpldir %}
  {#- Walk directory tree to find {{ files_dir }} #}
  {%- set subpath_parts = tpldir.lstrip(tplroot).lstrip('/').split('/') %}
  {%- for path in subpath_parts %}