tests: update platform from 64 to x86_64 in ntttcp.py

Signed-off-by: NYiqiao Pu <ypu@redhat.com>

tests/cfg/ntttcp.cfg

@@ -17,7 +17,7 @@
         - guest_host:
             # external Windows system IP, NTttcp need to be installed firstly.
             receiver_address = "192.168.1.1"
-    32:
+    i386:
         ntttcp_install_cmd = 'cmd /c "D:\autoit3.exe D:\NTttcp\NTttcp.au3 && mkdir C:\NTttcp && copy "C:\Program Files\Microsoft Corporation\NT Testing TCP Tool\*" C:\NTttcp && cd C:\NTttcp\ && copy NTttcp_%s.exe NTttcps.exe && copy NTttcp_%s.exe NTttcpr.exe"'
-    64:
+    x86_64:
         ntttcp_install_cmd = 'cmd /c "D:\autoit3.exe D:\NTttcp\NTttcp.au3 && mkdir C:\NTttcp && copy "C:\Program Files (x86)\Microsoft Corporation\NT Testing TCP Tool\*" C:\NTttcp && cd C:\NTttcp\ && copy NTttcp_%s.exe NTttcps.exe && copy NTttcp_%s.exe NTttcpr.exe"'

tests/ntttcp.py

@@ -24,7 +24,7 @@ def run_ntttcp(test, params, env):
     results_path = os.path.join(test.resultsdir,
                                 'raw_output_%s' % test.iteration)
     platform = "x86"
-    if params.get("platform") == "64":
+    if params.get("platform") == "x86_64":
         platform = "x64"
     buffers = params.get("buffers").split()
     buf_num = params.get("buf_num", 200000)