## Description:
More fixes flagged by pylint 2 that don't hurt to have before the actual pylint 2 upgrade (which I'll submit soon).
## Checklist:
- [ ] The code change is tested and works locally.
- [x] Local tests pass with `tox`. **Your PR cannot be merged unless tests pass**
* moved regular updates definition to own method to be able to override behaviour in subclass
* moved filter by max entries to own method to be able to override behaviour in subclass
* event type used when firing events to the bus now based on variable to be able to override behaviour in subclass
* feed id introduced instead of url for storing meta-data about the feed to be able to fetch the same feed from different configs with different filtering rules applied
* keep the status of the last update; continue processing the entries retrieved even if a recoverable error was detected while fetching the feed
* added test cases for feedreader component
* better explanation around breaking change
* fixing lint issues and hound violations
* fixing lint issue
* using assert_called_once_with instead of assert_called_once to make it compatible with python 3.5
Right now we ignore already parsed entries and store the information
at runtime, but it will not survive a restart. This patch adds storage
functionality storing pickled file into default config folder when
feed has `published_parsed` support.
* process only last 20 available entries to avoid bombing event
bus when parsing huge feeds
* trigger first update only when HA has completed startup,
allowing components to complete subscriptions to feedreader
events
* quote url in logs for better readability
* bugfix: ignore not existing property in feedreader item
* add info and debug data
* split logic in smaller and hopefully easier to understand functions