Update docker-py APIError imports

Author: aanand

fig/cli/main.py

@@ -15,7 +15,7 @@
 from .log_printer import LogPrinter
 from .utils import yesno
 
-from ..packages.docker.client import APIError
+from ..packages.docker.errors import APIError
 from .errors import UserError
 from .docopt_command import NoSuchCommand
 from .socketclient import SocketClient

fig/service.py

@@ -1,6 +1,6 @@
 from __future__ import unicode_literals
 from __future__ import absolute_import
-from .packages.docker.client import APIError
+from .packages.docker.errors import APIError
 import logging
 import re
 import os

tests/service_test.py

@@ -2,7 +2,7 @@
 from __future__ import absolute_import
 from fig import Service
 from fig.service import CannotBeScaledError, ConfigError
-from fig.packages.docker.client import APIError
+from fig.packages.docker.errors import APIError
 from .testcases import DockerClientTestCase