Cleanup and convert ObjectLocalIdStoreTests to be pure unit tests.
Cleanup and convert ObjectLocalIdStoreTests to be pure unit tests.

gonzalonunez/Parse-SDK-iOS-OSX,ParsePlatform/Parse-SDK-iOS-OSX,podkovyrin/Parse-SDK-iOS-OSX,podkovyrin/Parse-SDK-iOS-OSX,natanrolnik/Parse-SDK-iOS-OSX,gonzalonunez/Parse-SDK-iOS-OSX,natanrolnik/Parse-SDK-iOS-OSX,ParsePlatform/Parse-SDK-iOS-OSX