refactor: less logging

lib/manager/dockerfile/extract.js

lib/platform/github/gh-got-wrapper.js

lib/platform/github/storage.js

lib/platform/gitlab/gl-got-wrapper.js

lib/workers/branch/index.js

lib/workers/branch/parent.js

lib/workers/global/cache.js

lib/workers/pr/index.js

lib/workers/repository/init/config.js

lib/workers/repository/init/semantic.js

lib/workers/repository/process/fetch.js

lib/workers/repository/process/limits.js

lib/workers/repository/process/write.js