Changed platform to py_platform to avoid name collisions. The naming collisions resulted in an error on linux machines

lib/spack/spack/test/architecture.py

@@ -3,7 +3,7 @@
 """
 import unittest
 import os
-import platform
+import platform as py_platform
 import spack
 from spack.architecture import *
 from spack.spec import *
@@ -61,9 +61,9 @@ def test_sys_type(self):
             my_platform_class = CrayXc()
         elif os.path.exists('/bgsys'):
             my_platform_class = Bgq()
-        elif 'Linux' in platform.system():
+        elif 'Linux' in py_platform.system():
             my_platform_class = Linux()
-        elif 'Darwin' in platform.system():
+        elif 'Darwin' in py_platform.system():
             my_platform_class = Darwin()
 
         self.assertEqual(str(output_platform_class), str(my_platform_class))