Fix linter errors

Mostly wrong import order, useless imports, etc.

runtests.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 #
 # Copyright (c) 2008-2009 Red Hat, Inc.
 #
@@ -19,6 +19,7 @@ import os
 import shutil
 import sys
 import tempfile
+import nose
 
 # Make sure we run from the source, this is tricky because the functional
 # tests need to find both the location of the 'tito' executable script,
@@ -34,7 +35,6 @@ SRC_BIN_DIR = os.path.abspath(os.path.join(TEST_SCRIPT_DIR, "bin/"))
 os.environ['TITO_SRC_BIN_DIR'] = SRC_BIN_DIR
 
 if __name__ == '__main__':
-    import nose
 
     print("Using Python %s" % sys.version)
     print("Using nose %s" % nose.__version__)

test/functional/release_copr_tests.py

@@ -15,12 +15,12 @@
 Functional Tests for the CoprReleaser.
 """
 
+from unittest import mock
+
 from functional.fixture import TitoGitTestFixture
 
-from unittest import mock
 from tito.compat import *  # NOQA
 from tito.release import CoprReleaser
-from unit import Capture
 
 PKG_NAME = "releaseme"
 

test/unit/bugtracker_tests.py

@@ -1,7 +1,8 @@
 import unittest
-from tito.bugtracker import BugzillaExtractor
 from unittest.mock import Mock, patch
 
+from tito.bugtracker import BugzillaExtractor
+
 
 class ExtractBugzillasTest(unittest.TestCase):
 

test/unit/common_tests.py

@@ -1,4 +1,3 @@
-#
 # Copyright (c) 2008-2009 Red Hat, Inc.
 #
 # This software is licensed to you under the GNU General Public License,
@@ -13,6 +12,18 @@
 # in this software or its documentation.
 
 """ Pure unit tests for tito's common module. """
+
+import os
+import re
+import unittest
+
+from unittest.mock import patch, call
+from tempfile import NamedTemporaryFile
+from textwrap import dedent
+from unit import open_mock, Capture
+from blessed import Terminal
+
+# Pure unit tests for tito's common module
 from tito.common import (replace_version, find_spec_like_file, increase_version,
     search_for, compare_version, run_command_print, find_wrote_in_rpmbuild_output,
     render_cheetah, increase_zstream, reset_release, find_file_with_extension,
@@ -23,15 +34,6 @@ from tito.common import (replace_version, find_spec_like_file, increase_version,
 from tito.compat import StringIO
 from tito.tagger import CargoBump
 
-import os
-import re
-import unittest
-
-from unittest.mock import Mock, patch, call
-from tempfile import NamedTemporaryFile
-from textwrap import dedent
-from unit import open_mock, Capture
-from blessed import Terminal
 
 
 class CommonTests(unittest.TestCase):