Reorder app.py imports
When testing locally on some systems, it appears that pylint fails on
the order of imports for `buildstream/_frontend/app.py`. This commit
changes the order of these imports.
This commit addresses issue !453.
diff --git a/buildstream/_frontend/app.py b/buildstream/_frontend/app.py
index 3cf2f51..c8f1f43 100644
--- a/buildstream/_frontend/app.py
+++ b/buildstream/_frontend/app.py
@@ -17,17 +17,16 @@
# Authors:
# Tristan Van Berkom <tristan.vanberkom@codethink.co.uk>
+from contextlib import contextmanager
import os
import sys
import resource
import traceback
import datetime
from textwrap import TextWrapper
-from contextlib import contextmanager
-from blessings import Terminal
-
import click
from click import UsageError
+from blessings import Terminal
# Import buildstream public symbols
from .. import Scope
