support get pslib version (#22835)

* get pslib version
* test=develop

cmake/external/pslib.cmake

@@ -31,6 +31,7 @@ SET(PSLIB_ROOT          ${PSLIB_INSTALL_DIR})
 SET(PSLIB_INC_DIR       ${PSLIB_ROOT}/include)
 SET(PSLIB_LIB_DIR       ${PSLIB_ROOT}/lib)
 SET(PSLIB_LIB           ${PSLIB_LIB_DIR}/libps.so)
+SET(PSLIB_VERSION_PY    ${PSLIB_DOWNLOAD_DIR}/pslib/version.py)
 SET(PSLIB_IOMP_LIB      ${PSLIB_LIB_DIR}/libiomp5.so) #todo what is this
 SET(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_RPATH}" "${PSLIB_ROOT}/lib")
 

python/setup.py.in

@@ -196,6 +196,8 @@ else:
 
 if '${WITH_PSLIB}' == 'ON':
     shutil.copy('${PSLIB_LIB}', libs_path)
+    if os.path.exists('${PSLIB_VERSION_PY}'):
+        shutil.copy('${PSLIB_VERSION_PY}', '${PADDLE_BINARY_DIR}/python/paddle/fluid/incubate/fleet/parameter_server/pslib/')
     package_data['paddle.libs'] += ['libps' + ext_name]
 
 if '${WITH_MKLDNN}' == 'ON':