Lua: Add integration tests for the 'allowArbitraryDataAccess' setting

Change-Id: I69a84c2e7dfdd5acb99836d9aba356304c7ad381
Move sites-related methods from wikibase to wikibase.sites

Change-Id: I6ee480f3f36eb5a3d0f5c7e4f0a4b4e7b5d8be4e
Merge "Lua: Add integration tests for the 'allowArbitraryDataAccess' setting"
Merge "Move sites-related methods from wikibase to wikibase.sites"