Fix for driver disconnect bug

    * Fix in remotemininetdriver which caused an exception
    * Modify teston.py to print exceptions encountered in disconnect
    * Fix Typo in mininet driver and modify log messages
    * Add return values to the disconnect functions
    * some code cleanup in teston.py
diff --git a/TestON/drivers/common/cli/emulator/remotemininetdriver.py b/TestON/drivers/common/cli/emulator/remotemininetdriver.py
index ad9e896..389a077 100644
--- a/TestON/drivers/common/cli/emulator/remotemininetdriver.py
+++ b/TestON/drivers/common/cli/emulator/remotemininetdriver.py
@@ -373,12 +373,7 @@
         """
         Called at the end of the test to disconnect the handle.
         """
-        response = ''
-        # print "Disconnecting Mininet"
         if self.handle:
-            self.handle.sendline( "exit" )
-            self.handle.expect( "exit" )
-            self.handle.expect( "(.*)" )
             # Close the ssh connection
             self.handle.sendline( "" )
             self.handle.expect( "\$" )
@@ -386,6 +381,7 @@
             self.handle.expect( "closed" )
         else:
             main.log.error( "Connection failed to the host" )
+        return main.TRUE
 
     def getFlowTable( self, protoVersion, sw ):
         """