Davanum Srinivas ee3f897ca7 update network-y stuff for supporting ubuntu/bionic as master ...

On bionic, we don't have eth0 hard coded. example below, so we use `ip
route` to figure out the default ethernet interface
```
dims@kubernetes-master:~$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: ens4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1460 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 42:01:0a:80:00:23 brd ff:ff:ff:ff:ff:ff
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default
    link/ether 02:42:b2:4e:dd:86 brd ff:ff:ff:ff:ff:ff
```

Also, bionic uses systemd-resolver by default and adds entries in
/etc/resolv.conf that CoreDNS does not link. So follow the
recommendation in the documentation to specify resolv.conf explicitly

2020-02-02 19:23:10 -05:00

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