/etc/resolv.conf is garbage on CentOS 7

[Tapio Tallgren]

I am trying to launch a system using Bifrost on CentOS 7. With the following config drive file,

-bash-4.2# cat /mnt/config/openstack/latest/network_data.json
{
    "links": [
        {
            "ethernet_mac_address": "52:54:00:f9:fb:7d",
            "id": "52:54:00:f9:fb:7d",
            "mtu": "1500",
            "type": "phy"
        }
    ],
    "networks": [
        {
            "dns_nameservers": [
                "8.8.8.8"
            ],
            "id": "ipv4-52:54:00:f9:fb:7d",
            "ip_address": "192.168.122.3",
            "link": "52:54:00:f9:fb:7d",
            "netmask": "255.255.255.0",
            "routes": [
                {
                    "gateway": "192.168.122.1",
                    "netmask": "0.0.0.0",
                    "network": "0.0.0.0"
                }
            ],
            "type": "ipv4"
        }
    ],
    "services": [
        {
            "address": [
                "8.8.8.8"
            ],
            "type": "dns"
        }
    ]
}

glean --noop produces

...
### Write /etc/resolv.conf
nameserver [u'8.8.8.8']
...

which is also what I see in /etc/resolv.conf. No idea if this bug is in Bifrost or in Glean part, but Glean development does not seem very active.
I tried setting the locales in Glean

    import locale
    locale.setlocale(locale.LC_ALL,'')

but that did not help. I was able to verify that LC_ALL was set to en_US.UTF-8.

[Tapio Tallgren (tapio-tallgren)]

The patch https://review.openstack.org/508113 seems to fix this. The bug was in bifrost, in the yaml format

[Mark Goddard (mgoddard)]

Cherry picked to stable/pike: https://review.openstack.org/#/c/526007