* refactor: Deduplicate setup_perms_for
`setup_perms_for` has two identical definitions in
frappe/utils/reset_doc.py and
frappe/patches/v7_2/setup_custom_perms.py
Remove definition from setup_custom_perms.py, use import instead
* refactor: Deduplicate get_parent_doc and set_timeline_doc
`get_parent_doc` and `set_timeline_doc` are accidentally defined twice in
frappe/core/utils.py and
frappe/core/doctype/communication/communication.py
Remove definition from communication.py, use import instead
* fix(python3): Replace urlopen import with six.moves.urllib.request.urlopen
