Manheim-c7n-tools

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* Fixes `53 <https://github.com/manheim/manheim-c7n-tools/issues/53>`__

* Add ``function_prefix`` option to ``manheim-c7n-tools.yml`` to allow passing this option to mugc. Default it to the current/default ``custodian-``.
* Have :py:class:`~.runner.MugcStep` use configured ``function_prefix`` instead of hard-coded ``custodian-``.
* New policy sanity check :py:meth:`~.PolicyGen._check_policy_function_prefix` - fail if a policy's ``function-prefix`` doesn't match the configured (``manheim-c7n-tools.yml``) ``function_prefix``.

* Switch from deprecated pep8 / pytest-pep8 to pycodestyle / pytest-pycodestyle.

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* Update policygen to add enabled/disabled status to generated policy documentation

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* Bump c7n and c7n-mailer installed version to `26ba07e <https://github.com/cloud-custodian/cloud-custodian/commit/26ba07ea569dfe320682f7509082fc9bead0ca4c>`__ in order to pull in `PR #5893 <https://github.com/cloud-custodian/cloud-custodian/pull/5893>`__, fix for `#5854 <https://github.com/cloud-custodian/cloud-custodian/issues/5854>`__ c7n config splunk sourcetype.
* Bump c7n and c7n-mailer versions in setup.py to match the latest versions released

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* Add a new ``disable`` option for rules to disable rules from parent rulesets
* Fix bug in rule overriding where rules with the same names were merged rather than the later rule completely overriding the older one

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* Add documentation on how to run ``c7n-mailer-replay``.
* Add ``-n`` / ``--never-match-re`` option to ``errorscan`` endpoint, to allow specifying a regex for log messages to never consider a failure/error.
* Bump c7n from `b62af99 <https://github.com/cloud-custodian/cloud-custodian/commit/b62af99171bf1163413d7f7411e4a0db8a50f27e>`__ (master after 0.9.1 plus some merged PRs) to the upstream `0.9.3 release <https://github.com/cloud-custodian/cloud-custodian/releases/tag/0.9.3.0>`__. This pulls in changes from the upstream `0.9.2.0 <https://github.com/cloud-custodian/cloud-custodian/releases/tag/0.9.2.0>`__ and `0.9.3.0 <https://github.com/cloud-custodian/cloud-custodian/releases/tag/0.9.3.0>`__ releases.
* Bump c7n-mailer from `b62af99 <https://github.com/cloud-custodian/cloud-custodian/commit/b62af99171bf1163413d7f7411e4a0db8a50f27e>`__ (master after 0.6.0 plus some merged PRs) to the upstream 0.6.2 release. This pulls in changes from the upstream `0.9.2.0 <https://github.com/cloud-custodian/cloud-custodian/releases/tag/0.9.2.0>`__ and `0.9.3.0 <https://github.com/cloud-custodian/cloud-custodian/releases/tag/0.9.3.0>`__ releases.