pep8: Ignore line break before binary operator

PEP8 has switched its guidance [1] for where a line break should occur
in relation to a binary operator, so don't raise this warning for
new code and update the code base to follow the new style.

[1] https://www.python.org/dev/peps/pep-0008/#should-a-line-break-before-or-after-a-binary-operator

wa/framework/output.py

@@ -268,8 +268,8 @@ class RunOutput(Output, RunOutputCommon):
         self._combined_config = None
         self.jobs = []
         self.job_specs = []
-        if (not os.path.isfile(self.statefile) or
-                not os.path.isfile(self.infofile)):
+        if (not os.path.isfile(self.statefile)
+                or not os.path.isfile(self.infofile)):
             msg = '"{}" does not exist or is not a valid WA output directory.'
             raise ValueError(msg.format(self.basepath))
         self.reload()