trove pylint cleanup(s)

This commit includes two cleanups in trove-pylint.

First, the deprecation warning is because the text.ParseableOutputFormat is
being deprecated[1] and produces a deprecation warning as shown in the
bug.

Second, while looking into 1650816, I stumbled upon 1650888 which is
also fixed. A block of code was wrongly indented and when I disabled
"-E" to generate warnings, produced a crash in pylint. If the line
generated doesn't match the regular expression, the various parameters
to the next call (to ignore()) are not set and you get unbound
variable errors.

[1] https://github.com/PyCQA/pylint/blob/master/pylint/reporters/text.py#L163

Change-Id: I43bd6569a98eeb1b326e4a0ca1addaf97c0830a5
Closes-Bug: #1650530
Closes-But: #1650888

tools/trove-pylint.py

@@ -194,6 +194,13 @@ def usage():
     print("\t   rebuild: rebuild the list of exceptions to ignore.")
     return 0
 
+class ParseableTextReporter(text.TextReporter):
+    name = 'parseable'
+    line_format = '{path}:{line}: [{msg_id}({symbol}), {obj}] {msg}'
+
+    # that's it folks
+
+
 class LintRunner(object):
     def __init__(self):
         self.config = Config()
@@ -204,7 +211,7 @@ class LintRunner(object):
         exceptions = set()
 
         buffer = csio()
-        reporter = text.ParseableTextReporter(output=buffer)
+        reporter = ParseableTextReporter(output=buffer)
         options = list(self.config.get('options'))
         options.append(filename)
         lint.Run(options, reporter=reporter, exit=False)