run dist train test single process

python/paddle/fluid/tests/unittests/CMakeLists.txt

@@ -62,6 +62,7 @@ list(REMOVE_ITEM TEST_OPS test_registry)
 list(REMOVE_ITEM TEST_OPS test_fetch_var)
 list(REMOVE_ITEM TEST_OPS test_parallel_op)
 list(REMOVE_ITEM TEST_OPS test_dynrnn_static_input)
+list(REMOVE_ITEM TEST_OPS test_dist_train)
 
 # tests that can be bundled together in one python process for speed.
 if(WITH_FAST_BUNDLE_TEST)
@@ -100,3 +101,4 @@ py_test_modules(test_registry MODULES test_registry)
 py_test_modules(test_fetch_var MODULES test_fetch_var)
 py_test_modules(test_dynrnn_static_input MODULES test_dynrnn_static_input)
 py_test_modules(test_parallel_op MODULES test_parallel_op)
+py_test_modules(test_dist_train MODULES test_dist_train)