Using Sitecore configuration API from Service Configurator

OR when you are facing with the following exception:

	[LockRecursionException: A read lock may not be acquired with the write lock held in this mode.]
	System.Threading.ReaderWriterLockSlim.TryEnterReadLockCore(TimeoutTracker timeout) +1347
	System.Threading.ReaderWriterLockSlim.TryEnterReadLock(TimeoutTracker timeout) +44
	Sitecore.DependencyInjection.ServiceLocator.get_ServiceProvider() +176
	Sitecore.Configuration.<>c.<.cctor>b__360_0() +9
	System.Lazy`1.CreateValue() +734
	System.Lazy`1.LazyInitValue() +189
	Sitecore.Configuration.Settings.GetSetting(String name) +48