add pep8 options to tox.ini

Add the pep8 section to tox.ini and specify ignoring E113.
Many E113 errors appeared on comments. It seems a bug of pep8, so it can be ignored.

Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

run_tests.sh

@@ -106,8 +106,7 @@ run_pylint() {
 run_pep8() {
   echo "Running pep8 ..."
 
-  PEP8_EXCLUDE="vcsversion.py,*.pyc,contrib,dictconfig.py"
-  PEP8_OPTIONS="--exclude=$PEP8_EXCLUDE --repeat --show-source"
+  PEP8_OPTIONS="--repeat --show-source"
   PEP8_INCLUDE="ryu setup*.py"
   PEP8_LOG=pep8.log
   ${wrapper} pep8 $PEP8_OPTIONS $PEP8_INCLUDE | tee $PEP8_LOG

tox.ini

@@ -7,3 +7,7 @@ deps = -U
        -r{toxinidir}/tools/test-requires
 commands =
   python ryu/tests/run_tests.py
+
+[pep8]
+exclude = vcsversion.py,.pyc,ryu/contrib,dictconfig.py
+ignore = E113