Arouteserver

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- New: add support for BIRD v2.

**Please note**: BIRD v2 support is in early stages. Before moving any production platform to instances of BIRD v2 configured with this tool, please review the configurations carefully and run some simulations.

- New: OpenBGPD/OpenBSD 6.6, OpenBGPD Portable 6.6p0 and BIRD 1.6.8 added to the integration testing suite.

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- Fix: prevent environment variables with unknown escapes (like `\u`) from interrupting the execution.

Related: `issue 50 on GitHub <https://github.com/pierky/arouteserver/issues/50>`_.

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- Fix: handle more formats for ROAs exported from the public instances of RIPE and NTT validators.

A new way of representing ASNs (without the "AS" prefix) and new TA names which were not matched by the default values of ``rpki_roas.allowed_trust_anchors`` prevented ROAs from being imported and correctly processed when the default settings were used.

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This is the last release of ARouteServer for which Python 2.7 compatibility is guaranteed. From the next release, any new feature will not be tested against that version of Python.

- New: `OpenBGPD Portable <https://github.com/openbgpd-portable/openbgpd-portable>` (release 6.5p1) also supported.

Release 6.5p1 of OpenBGPD Portable edition passed the integration testing suite.

- New: add support for OpenBGPD/OpenBSD 6.5 enhancements.

Support for matching multiple communities at the same time allows to create more readable configurations.

- Improvement: OpenBGPD, some filters refinement.

Avoid checking AS0 in AS_PATH since 6.4.
No needs to check routes of an address family different than the one used for the session.

As announced with release 0.20.0, OpenBGPD/OpenBSD 6.2 is no longer tested. Also OpenBGPD/OpenBSD 6.3 tests have been decommissioned.
Starting with this release, tests will be executed only against the 2 most recent releases of OpenBGPD/OpenBSD and against the last release of the supported major versions of BIRD.
The implementation of new features may break compatibility of the configurations built for unsupported releases.

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- Deprecation: SAVVIS IRR removed from the list of default sources used by bgpq3.

- Fix (minor): truncate the max length of AS-SET names to 64 characters.

BIRD supports only names no longer than 64 characters.

Related: `issue 47 on GitHub <https://github.com/pierky/arouteserver/issues/47>`_.

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- Improvement: when ``ripe-rpki-validator-cache`` is set as the source of ROAs, multiple URLs can now be specified to fetch data from.

URLs will be tried in the same order as they are configured; if the attempt to download ROAs from the first URL fails, the second URL will be tried, an so on.

By default, the `RIPE NCC public instance <https://rpki-validator.ripe.net/>`_ of the RIPE RPKI Validator will be tried first, then the `NTT instance <https://rpki.gin.ntt.net/>`_. The list of URLs can be set in the ``general.yml`` configuration file, ``roas.ripe_rpki_validator_url`` option.