Switch to pep8 output format

Change output format so it would follow the same
default format used by pep8/pycodestyle which is
parsable by many tools.

Relates to https://review.openstack.org/335520

Change-Id: I3e34ec09d439104482a979f7b63d393b9faccdb4

README.rst

@@ -9,6 +9,10 @@ to fill the same part of code review that pep8 does in most OpenStack
 projects. It started from humble beginnings in the DevStack project,
 and will continue to evolve over time.
 
+The output format aims to follow `pycodestyle (pep8) default output format
+<https://github.com/PyCQA/pycodestyle/blob/master/pycodestyle.py#L108>`_.
+
+
 - Free software: Apache license
 - Documentation: https://docs.openstack.org/bashate
 - Source: https://git.openstack.org/cgit/openstack-dev/bashate

bashate/bashate.py

@@ -296,11 +296,14 @@ class BashateRun(object):
         self.log_error(error, line, filename, filelineno, warn)
 
     def log_error(self, error, line, filename, filelineno, warn=False):
-        print("[%(warn)s] %(error)s: '%(line)s'" %
+        # following pycodestyle/pep8 default output format
-              {'warn': "W" if warn else "E",
+        # https://github.com/PyCQA/pycodestyle/blob/master/pycodestyle.py#L108
-               'error': error,
+        print("%(filename)s:%(filelineno)s:1: %(error)s" %
+              {'filename': filename,
+               'filelineno': filelineno,
+               'warn': "W" if warn else "E",
+               'error': error.replace(":", "", 1),
                'line': line.rstrip('\n')})
-        print(" - %s : L%s" % (filename, filelineno))
 
     def check_files(self, files, verbose):
         logical_line = ""

releasenotes/notes/adopt-pycodestyle-output-format-f4d6e35dadfcb6f9.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    Adoped pycodestyle/pep8 default output format.