`go-kit/kit/log` was deprecated and generating warnings
# Checklist for submitter
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<!-- Note that API documentation changes are now addressed by the
product design team. -->
- [x] Manual QA for all new/changed functionality
Feature: Improve our capability to detect vulnerable software on Ubuntu hosts
To improve the capability of detecting vulnerable software on Ubuntu, we are now using OVAL definitions to detect vulnerable software on Ubuntu hosts. If data sync is enabled (disable_data_sync=false) OVAL definitions are automatically kept up to date (they are 'refreshed' once per day) - there's also the option to manually download the OVAL definitions using the 'fleetctl vulnerability-data-stream' command. Downloaded definitions are then parsed into an intermediary format and then used to identify vulnerable software on Ubuntu hosts. Finally, any 'recent' detected vulnerabilities are sent to any third-party integrations.
