* find_module can't pop ImportError- we need to just translate to `None` since this is a normal condition with files on sys.path (eg `/usr/lib/python36.zip`)
* added test
* `meta/` directory in collections
* runtime metadata for redirection/deprecation/removal of plugin loads
* a compatibility layer to keep existing content working on ansible-base + collections
* a Python import redirection layer to keep collections-hosted (and otherwise moved) content importable by things that don't know better
* supported Ansible version validation on collection loads