Fix missing partition path when opening a named partition database instance

- Fdb.OpenNamedPartitionAsync(...) should return a instance where db.Directory.FullName is the same as the partition Path
- Fixed invalid DebuggerDisplay attributes for FdbDirectoryLayer and FdbDatabasePartition

Author: KrzysFR

FoundationDB.Client/Layers/Directories/FdbDirectoryLayer.cs

@@ -47,7 +47,7 @@ namespace FoundationDB.Layers.Directories
 	/// <see cref="FdbDirectoryLayer"/> exposes methods to create, open, move, remove, or list directories. Creating or opening a directory returns the corresponding subspace.
 	/// The <see cref="FdbDirectorySubspace"/> class represents subspaces that store the contents of a directory. An instance of <see cref="FdbDirectorySubspace"/> can be used for all the usual subspace operations. It can also be used to operate on the directory with which it was opened.
 	/// </summary>
-	[DebuggerDisplay("Nodes={this.NodeSubspace}, Contents={this.ContentsSubspace}")]
+	[DebuggerDisplay("FullName={FullName}, Contents={ContentSubspace}, Nodes={NodeSubspace}")]
 	public class FdbDirectoryLayer : IFdbDirectory
 	{
 		private const int SUBDIRS = 0;

FoundationDB.Client/Subspaces/Fdb.Directory.cs

@@ -86,7 +86,7 @@ public static async Task<IFdbDatabase> OpenNamedPartitionAsync(string clusterFil
 					// we have to chroot the database to the new prefix, and create a new DirectoryLayer with a new '/'
 					rootSpace = descriptor.Copy(); //note: create a copy of the key
 					//TODO: find a nicer way to do that!
-					db.ChangeRoot(rootSpace, FdbDirectoryLayer.Create(rootSpace), readOnly);
+					db.ChangeRoot(rootSpace, FdbDirectoryLayer.Create(rootSpace, partitionPath), readOnly);
 
 					if (Logging.On) Logging.Info(typeof(Fdb.Directory), "OpenNamedPartitionAsync", String.Format("Opened partition {0} at {1}, using directory layer at {2}", descriptor.FullName, db.GlobalSpace, db.Directory.DirectoryLayer.NodeSubspace));
 

FoundationDB.Client/Subspaces/FdbDatabasePartition.cs

@@ -37,7 +37,7 @@ namespace FoundationDB.Client
 	using System.Threading.Tasks;
 
 	/// <summary>View of a database that is bound to a specific Partition</summary>
-	[DebuggerDisplay("Database={Database.Name}, Contents={Directory.ContentsSubspace}, Nodes={Directory.NodeSubspace}")]
+	[DebuggerDisplay("Database={Database.Name}, Partition={Directory.FullName}, Prefix={Database.GlobalSpace}")]
 	public sealed class FdbDatabasePartition : IFdbDirectory
 	{
 		private readonly IFdbDatabase m_database;