Fix up drivers - we're now using self.logger to wrap pexpect

Change-Id: I531a886c535d3e92a16158f102494f596cf6666c
diff --git a/drivers/TPLinkTLSG2XXX.py b/drivers/TPLinkTLSG2XXX.py
index 37d81cb..32afdd4 100644
--- a/drivers/TPLinkTLSG2XXX.py
+++ b/drivers/TPLinkTLSG2XXX.py
@@ -385,7 +385,7 @@
             self.connection = None
 
         logging.debug("Connecting to Switch with: %s", self.exec_string)
-        self.connection = pexpect.spawn(self.exec_string, logfile = self.logfile)
+        self.connection = pexpect.spawn(self.exec_string, logfile=self.logger)
         self._login()
 
         # No way to avoid paged output on this switch AFAICS