allow both ipv4 and ipv6 hostnames by default

[OpenStack Infra]

https://review.openstack.org/109219

Dear documentation bug triager. This bug was created here because we did not know how to map the project name "openstack/trove" to a launchpad project name. This indicates that the notify_impact config needs tweaks. You can ask the OpenStack infra team (#openstack-infra on freenode) for help if you need to.

commit 2c12fcfadc9184d53c8ae3f39ddb4cb40d8441c6
Author: Ionuț Arțăriși <email address hidden>
Date: Thu Jul 24 10:57:47 2014 +0200

    allow both ipv4 and ipv6 hostnames by default

    Refactored the code to use netaddr rather than re-implementing IP
    address validation. This gives us IPv6 support for free.

    DocImpact
    The hostname_require_ipv4 configuration option is being
    removed in favor of hostname_require_valid_ip. The latter is more
    inclusive and validates both IPv4 and IPv6 addresses.

    Change-Id: I36c76169f2ab3bb7f54f67db522309a49ae61f7a
    Closes-Bug: #1343192

[Andreas Jaeger (jaegerandi)]

Fixed as part of Ie7e20a2a5552f7fdd2b5a0c713a0a4f7fbed9ec2