Support for alias interfaces

[Adam Huffman]

I'm testing TripleO on some temporary nodes, until my real hardware arrives.

There is currently only one NIC available on each node, so I've created alias interfaces.

It looks like os-net-config does not support these, because it makes a simple search for /sys/class/net/<interface name> rather than the parent interface name.

E.g.

 "[2018/04/13 11:16:02 AM] [INFO] Using config file at: /etc/os-net-config/config.json",
                "[2018/04/13 11:16:02 AM] [INFO] Ifcfg net config provider created.",
                "[2018/04/13 11:16:02 AM] [INFO] Not using any mapping file.",
                "[2018/04/13 11:16:03 AM] [INFO] Finding active nics",
                "[2018/04/13 11:16:03 AM] [INFO] lo is not an active nic",
                "[2018/04/13 11:16:03 AM] [INFO] em1 is an embedded active nic",
                "[2018/04/13 11:16:03 AM] [INFO] docker0 is not an active nic",
                "[2018/04/13 11:16:03 AM] [INFO] No DPDK mapping available in path (/var/lib/os-net-config/dpdk_mapping.yaml)",
                "[2018/04/13 11:16:03 AM] [INFO] Active nics are ['em1']",
                "[2018/04/13 11:16:03 AM] [INFO] nic1 mapped to: em1",
                "[2018/04/13 11:16:03 AM] [INFO] adding bridge: br-ctlplane",
                "[2018/04/13 11:16:03 AM] [ERROR] Unable to read mac address: em1:1",

where I have used parameter_defaults in the undercloud deploy command invocation to set the interface name to em1:1

[Adam Huffman (adam-huffman)]

The version in use is os-net-config-8.4.1-0.20180328025607.08a0f08.el7.centos.noarch