move test_nvprof to new location

Author: panyx0718

python/paddle/v2/fluid/tests/unittests/test_nvprof.py renamed to python/paddle/fluid/tests/unittests/test_nvprof.py

@@ -15,10 +15,10 @@
 import unittest
 import os
 import numpy as np
-import paddle.v2.fluid as fluid
-import paddle.v2.fluid.profiler as profiler
-import paddle.v2.fluid.layers as layers
-import paddle.v2.fluid.core as core
+import paddle.fluid as fluid
+import paddle.fluid.profiler as profiler
+import paddle.fluid.layers as layers
+import paddle.fluid.core as core
 
 
 class TestNVProf(unittest.TestCase):