tox.ini: no pep8 env by default, fix testenv:pep8 env

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.9
-envlist = py3,pep8
+envlist = tests
 skipsdist = True
 toxworkdir = {env:TOXWORKDIR:.tox}
 
@@ -11,17 +11,20 @@ deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 usedevelop = true
 whitelist_externals = bash
+
+[testenv:tests]
 changedir = tests
 commands = bash ./test.bash -t
 
 [testenv:pep8]
-commands = flake8 --ignore=E123,E125
+commands = flake8
 
 [flake8]
 # E123, E125 skipped as they are invalid PEP-8.
+# also ignore E501 because barectf has very long lines
 
 show-source = True
-ignore = E123,E125
+ignore = E123,E125,E501
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build