support/testing: fix code style

Fix the trivial warnings from flake8:
 - remove modules imported but unused;
 - use 2 lines before class or module level method;
 - remove blank line at end of file.

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

support/testing/tests/core/test_post_scripts.py

@@ -3,6 +3,7 @@ import csv
 
 import infra.basetest
 
+
 class TestPostScripts(infra.basetest.BRTest):
     config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
         """

support/testing/tests/core/test_rootfs_overlay.py

@@ -3,9 +3,11 @@ import subprocess
 
 import infra.basetest
 
+
 def compare_file(file1, file2):
     return subprocess.call(["cmp", file1, file2])
 
+
 class TestRootfsOverlay(infra.basetest.BRTest):
 
     rootfs_overlay_path = infra.filepath("tests/core/rootfs-overlay")

support/testing/tests/core/test_timezone.py

@@ -2,12 +2,14 @@ import os
 
 import infra.basetest
 
+
 def boot_armv5_cpio(emulator, builddir):
         img = os.path.join(builddir, "images", "rootfs.cpio")
         emulator.boot(arch="armv5", kernel="builtin",
                       options=["-initrd", img])
         emulator.login()
 
+
 class TestNoTimezone(infra.basetest.BRTest):
     config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
         """
@@ -23,6 +25,7 @@ class TestNoTimezone(infra.basetest.BRTest):
         tz, _ = self.emulator.run("TZ=America/Los_Angeles date +%Z")
         self.assertEqual(tz[0].strip(), "UTC")
 
+
 class TestGlibcAllTimezone(infra.basetest.BRTest):
     config = \
         """
@@ -44,6 +47,7 @@ class TestGlibcAllTimezone(infra.basetest.BRTest):
         tz, _ = self.emulator.run("TZ=Europe/Paris date +%Z")
         self.assertEqual(tz[0].strip(), "CET")
 
+
 class TestGlibcNonDefaultLimitedTimezone(infra.basetest.BRTest):
     config = \
         """