Refactor repository worker (#344)

* Move to subdir

* Downgrade eslint to 3

* Refactor api and config usage

* Refactor mergeRenovateJson

* Test mergeRenovateJson

* getOnboardingStatus tests

* Refactor repository structure

* Refactor config.logger

* Revert "Refactor config.logger"

This reverts commit 6d7f81af6ee284d01aab811dab7eb05c2274edf3.

* Refactor repository logging

* Refactor try/catch

* Refactor platform and onboarding

* Refactor setNpmrc

* Fix github logger

* npm api use config.logger

* Refactor repo worker logger

* Refactor repo worker

* Refactor branched upgrades

* Repository refactoring

* Move some debug logging to trace

* Deprecate fileName

* Refactor upgrades

* Refactor repository logs

* More repository log refactoring

* Refactor repository location

* Revert "Refactor repository location"

This reverts commit faecbf29516737a2752de54103c0228b9112a51c.

* Fix tests

* mergeRenovateJson

* Recombine repository worker

* Add initApis tests

* add detectPackageFiles tests

* Add determineRepoUpgrades tests

* start groupUpgradesByBranch tests

* add test

* add test

* Finish groupUpgradesByBranch coverage

* Test updateBranchesSequentially

* Finish repo coverage

* Finish branch worker coverage

* Finish workers coverage

* Fix isPin

* Complete workers coverage

* Finish helpers coverage

* Add gitlab api tests

* getBranchStatus tests

* test createPr

* start getPr testing

* getPr

* update and merge PR tests

* getFile

* getFileContent tests

* getFileJson tests

* createFile

* updateFile

* createBranch

* commitFilesToBranch

* update yarn

* Update yarn