[client][managed][offline] minor refactoring in the store
Merge pull request #422 from hasankhan/storerefactor

[client][managed][offline] minor refactoring in the store
[client][managed][offline] minor rename in tests
[client][managed][appsync] app settings implementation
[client][managed][appsync] ensure pull async hits the right endpoint for app settings
[client][managed][appsync] added TryGet method
[client][managed][appsync] adjusted login-load settings code