zdtm: use flake8 to verify zdtm.py

and fix various warnings. For example, we mix tab and space indentations.

v2: add flake8.cfg

Cc: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Andrew Vagin <avagin@virtuozzo.com>
Acked-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Makefile

@@ -321,6 +321,9 @@ help:
 	@echo '      gcov            - Make code coverage report'
 .PHONY: help
 
+lint:
+	flake8 --config=scripts/flake8.cfg test/zdtm.py
+
 include Makefile.install
 
 .DEFAULT_GOAL := all

scripts/flake8.cfg

+[flake8]
+# W191 indentation contains tabs
+# E128 continuation line under-indented for visual indent
+# E501 line too long
+# E251 unexpected spaces around keyword / parameter equals
+# E101 indentation contains mixed spaces and tabs
+# E126 continuation line over-indented for hanging indent 
+ignore = W191,E128,E501,E251,E101,E126

scripts/travis-tests

@@ -9,3 +9,6 @@ chmod a+x $HOME
 make
 make -C test/zdtm
 python test/zdtm.py run -a -f h,ns -x 'cgroup*'
+
+pip install flake8
+make lint