deps: added rc_testdata and flake8

requirements_debug.txt

@@ -8,3 +8,4 b' memory-profiler'
 pympler
 ipdb
 ipython
+flake8

requirements_test.txt

@@ -39,3 +39,6 b' webtest==3.0.0'
     soupsieve==2.4
   waitress==2.1.2
   webob==1.8.7
+
+# RhodeCode test-data
+rc-testdata @ https://code.rhodecode.com/upstream/rc_testdata/archive/default.tar.gz?with_hash=1&sha256=76c9ed4ea955971774db2daf3076f38b7388ccc1338b6fd0c02800ab99400426