1. import fluid to dist transpiler test

Author: velconia

python/paddle/fluid/tests/unittests/test_dist_transpiler.py

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import paddle.fluid as fluid
 from paddle.fluid.transpiler.distribute_transpiler import delete_ops
 
 from transpiler_test import TranspilerTest