Add debug output messages for TCP handling

lib/web/Close-IcingaTCPConnection.psm1

@@ -8,6 +8,13 @@ function Close-IcingaTCPConnection()
         return;
     }
 
+    Write-IcingaDebugMessage -Message (
+        [string]::Format(
+            'Closing client connection for endpoint {0}',
+            $Client.Client.RemoteEndPoint
+        )
+    );
+
     $Client.Close();
     $Client.Dispose();
     $Client = $null;

lib/web/Close-IcingaTCPSocket.psm1

@@ -8,5 +8,12 @@ function Close-IcingaTCPSocket()
         return;
     }
 
+    Write-IcingaDebugMessage -Message (
+        [string]::Format(
+            'Closing TCP socket {0}',
+            $Socket.LocalEndpoint
+        )
+    );
+
     $Socket.Stop();
 }

lib/web/New-IcingaTCPClient.psm1

@@ -10,5 +10,12 @@ function New-IcingaTCPClient()
 
     [System.Net.Sockets.TcpClient]$Client = $Socket.AcceptTcpClient();
 
+    Write-IcingaDebugMessage -Message (
+        [string]::Format(
+            'New incoming client connection for endpoint {0}',
+            $Client.Client.RemoteEndPoint
+        )
+    );
+
     return $Client;
 }

lib/web/New-IcingaTCPSocket.psm1

@@ -11,7 +11,21 @@ function New-IcingaTCPSocket()
 
     $TCPSocket = [System.Net.Sockets.TcpListener]$Port;
 
+    Write-IcingaDebugMessage -Message (
+        [string]::Format(
+            'Creating new TCP socket on Port {0}. Endpoint configuration {1}',
+            $Port,
+            $TCPSocket.LocalEndpoint
+        )
+    );
+
     if ($Start) {
+        Write-IcingaDebugMessage -Message (
+            [string]::Format(
+                'Starting TCP socket for endpoint {0}',
+                $TCPSocket.LocalEndpoint
+            )
+        );
         $TCPSocket.Start();
     }