introspect: Support absolute file paths
introspect: Support absolute file paths

The "introspect" tool previously supported module names as its argument
(e.g. "Filter.Unread"). This adds a --file argument that takes a path
which will be imported instead.

https://phabricator.endlessm.com/T15141

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib