* If user doesn't specify the subnets to create a network, it will pick subnets from inside preferred pool. This PR aims to inspect these subnets info * Add integration tests for docker inspect the subnets. * docker-py project is already synchronized. * jenkins checks depend on https://github.com/docker/docker-py/pull/888 Fixes issue #18626 Signed-off-by: Wen Cheng Ma <wenchma@cn.ibm.com>