Update namespaces for XmlConfiguration classes

src/Microsoft.Framework.Configuration.Xml/EncryptedXmlDocumentDecryptor.cs

@@ -6,7 +6,7 @@ using System;
 using System.Security.Cryptography.Xml;
 using System.Xml;
 
-namespace Microsoft.Framework.Configuration
+namespace Microsoft.Framework.Configuration.Xml
 {
     /// <summary>
     /// A decryptor that uses the EncryptedXml class in the desktop CLR.

src/Microsoft.Framework.Configuration.Xml/XmlConfigurationSource.cs

@@ -6,9 +6,8 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Xml;
-using Microsoft.Framework.Configuration.Xml;
 
-namespace Microsoft.Framework.Configuration
+namespace Microsoft.Framework.Configuration.Xml
 {
     /// <summary>
     /// An XML file based <see cref="ConfigurationSource"/>.

src/Microsoft.Framework.Configuration.Xml/XmlDocumentDecryptor.cs

@@ -4,9 +4,8 @@
 using System;
 using System.IO;
 using System.Xml;
-using Microsoft.Framework.Configuration.Xml;
 
-namespace Microsoft.Framework.Configuration
+namespace Microsoft.Framework.Configuration.Xml
 {
     internal class XmlDocumentDecryptor
     {