UPD: improved requirements management and coverage-html.py

.buildbot/test/01-requirements.sh

@@ -1,10 +1,6 @@
 python_major_version=`python -c 'import sys; print sys.version_info.major'`
 if test "$python_major_version" = "2" ; then
 	pip install 'django<2'
-fi
-pip install -r requirements.txt
-if test "$python_major_version" = "2" ; then
 	pip install 'pylint-django<2'
-else
-	pip install pylint-django
 fi
+pip install -r requirements-test.txt