Updates TN3270.lua and scripts. It also adds an argument to disable TN3270. Closes #1455

scripts/tso-enum.nse

@@ -57,6 +57,7 @@ TSO user IDs have the following rules:
 -- 2015-10-30 - v0.2 - streamlined the code, relying on brute and unpwdb and
 --                     renamed to tso-enum.
 -- 2017-1-13  - v0.3 - Fixed 'data' bug and added options checking to speedup
+-- 2019-02-01 - v0.4 - Disabled TN3270 Enhanced support and fixed debug errors
 
 
 author = "Philip Young aka Soldier of Fortran"
@@ -74,6 +75,7 @@ Driver = {
     o.port = port
     o.options = options
     o.tn3270 = tn3270.Telnet:new()
+    o.tn3270:disable_tn3270e()
     return o
   end,
   connect = function( self )
@@ -165,6 +167,7 @@ Driver = {
 local function tso_test( host, port, commands )
   stdnse.debug("Checking for TSO")
   local tn = tn3270.Telnet:new()
+  tn:disable_tn3270e()
   local status, err = tn:initiate(host,port)
   local tso = false -- initially we're not at TSO logon panel
   local secprod = "RACF"
@@ -211,6 +214,7 @@ end
 local function tso_skip( host, port, commands )
   stdnse.debug("Checking for IKJ56700A message skip")
   local tn = tn3270.Telnet:new()
+  tn:disable_tn3270e()
   stdnse.debug2("Connecting TN3270 to %s:%s", host.targetname or host.ip, port.number)
   local status, err = tn:initiate(host,port)
   stdnse.debug2("Displaying initial TN3270 Screen:")