general_hardcoded_password plugin throws AttributeError exception on Python3

[vamshi basupalli]

On Python3, `general_hardcoded_password` plugin throws `AttributeError` exception while handling a `RuntimeError` exception.

In the file `general_hardcoded_password.py`, the method `hardcoded_password`, while handling `RuntimeError` exception tries to access `message` attribute and fails.

In Python-3, an object of `RuntimeError` class does not have a `message` attribute . This attribute is only available in Python-2, where `RuntimeError` inherits the attribute from `BaseException`

[Tim Kelsey (tim-kelsey)]

This is likely fixed by the new version of the hardcoded password tests

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/230384
Committed: https://git.openstack.org/cgit/openstack/bandit/commit/?id=604ca79759b3d23a01ce661fad58469e525e13b8
Submitter: Jenkins
Branch: master

commit 604ca79759b3d23a01ce661fad58469e525e13b8
Author: Tim Kelsey <email address hidden>
Date: Fri Oct 2 12:41:00 2015 +0100

    Improved tests for hardcoded passwords

    This replaces the existing hardcoded password test with a number of
    smarter tests. None of the new tests utilize a word dictionary, we
    now trigger the warnings based on matching variable names and the
    like against a list of candidate names:

     - "password"
     - "pass"
     - "passwd"
     - "pwd"
     - "secret"
     - "token"

    hardcoded_password_string looks for:
     candidate = "some_string_literal"
     dict[candidate] = "some_string_literal"
     candidate == "some_string_literal"

    hardcoded_password_funcarg looks for:
     func_call(candidate="some_string_literal")

    hardcoded_password_default looks for:
     def func_def(candidate="some_string_literal"):

    All issues are reported as MEDIUM confidence, LOW severity

    Closes-bug: #1502348
    Closes-bug: #1502343
    Closes-bug: #1432887

    Change-Id: I36d97ee838a7f08234b759c352649721d07e8ab0