Add some missing newlines between import sections (#841)

Builtin, third party, and first party are all supposed to have a newline between
them. Most of the codebase was doing this, but some had snuck through. This
updates those ones to follow the coding style. These are caught by recent
changes in the code style checking plugin making it more strict / accurate.

cli/dcoscli/tables.py

@@ -4,6 +4,7 @@ import posixpath
 from collections import OrderedDict
 
 import prettytable
+
 from dcos import mesos, util
 
 EMPTY_ENTRY = '---'

cli/dcoscli/util.py

@@ -1,6 +1,7 @@
 from functools import wraps
 
 import docopt
+
 from dcos import emitting
 
 emitter = emitting.FlatEmitter()

dcos/config.py

@@ -7,6 +7,7 @@ import sys
 
 import pkg_resources
 import toml
+
 from dcos import constants, jsonitem, subcommand, util
 from dcos.errors import DCOSException
 

dcos/marathon.py

@@ -1,4 +1,5 @@
 import json
+
 import jsonschema
 import pkg_resources
 

dcos/subcommand.py

@@ -12,6 +12,7 @@ import zipfile
 from distutils.version import LooseVersion
 
 import requests
+
 from dcos import constants, util
 from dcos.errors import DCOSException
 from dcos.subprocess import Subproc

setup.py

@@ -1,5 +1,6 @@
 from codecs import open
 from os import path
+
 from setuptools import find_packages, setup
 
 import dcos