Merge pull request #8301 from aabadie/pr/flake8/testrunner

dist/tools/testrunner: fix flake8 remaining issues

.travis.yml

@@ -1,7 +1,8 @@
 dist: trusty
 
 before_install:
-  - sudo apt-get install coreutils realpath doxygen graphviz python-lesscpy cppcheck coccinelle pcregrep python3-flake8
+  - sudo apt-get install coreutils realpath doxygen graphviz python-lesscpy cppcheck coccinelle pcregrep python3-pip
+  - sudo pip3 install flake8
 
 script:
   - make static-test

dist/tools/testrunner/testrunner.py

@@ -27,12 +27,14 @@ MAKE_TERM_STARTED_DELAY = int(os.environ.get('TESTRUNNER_START_DELAY') or 3)
 def list_until(l, cond):
     return l[:([i for i, e in enumerate(l) if cond(e)][0])]
 
+
 def find_exc_origin(exc_info):
     pos = list_until(extract_tb(exc_info),
                      lambda frame: frame[0].startswith(PEXPECT_PATH)
                      )[-1]
     return (pos[3], os.path.relpath(os.path.abspath(pos[0]), RIOTBASE), pos[1])
 
+
 def run(testfunc, timeout=10, echo=True, traceback=False):
     env = os.environ.copy()
     child = pexpect.spawnu("make term", env=env, timeout=timeout)