Add some more logs for settings and decorations response
Add some more logs for settings and decorations response

Summary:
This changes adds a log statement when settings are loaded
and when the server responds to a decorations request

Test Plan: Tests still pass

Reviewers: fromberger, zarko

Reviewed By: zarko

Subscribers: #core_team

Differential Revision: https://phabricator-dot-kythe-repo.appspot.com/D1870

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