add mac ci check on import

paddle/scripts/paddle_build.sh

@@ -442,6 +442,7 @@ EOF
         make install -j 8
         if [ "$1" == "cp27-cp27m" ]; then
             pip install --user ${INSTALL_PREFIX:-/paddle/build}/opt/paddle/share/wheels/*.whl
+            python -c "import paddle.fluid"
         elif [ "$1" == "cp35-cp35m" ]; then
             pip3.5 install --user ${INSTALL_PREFIX:-/paddle/build}/opt/paddle/share/wheels/*.whl
         elif [ "$1" == "cp36-cp36m" ]; then
@@ -449,7 +450,7 @@ EOF
         elif [ "$1" == "cp37-cp37m" ]; then
             pip3.7 install --user ${INSTALL_PREFIX:-/paddle/build}/opt/paddle/share/wheels/*.whl
         fi
-
+      
         if [[ ${WITH_FLUID_ONLY:-OFF} == "OFF" ]] ; then
             paddle version
         fi