Do not replace lo0 address on Solaris

lo0 and lo0:0 are the same interface on Solaris.  Make sure
bin/tests/system/ifconfig.sh does not touch lo0:0 in order to prevent it
from changing the address of the loopback interface on Solaris.

(cherry picked from commit 61892190)
13 jobs for 419-do-not-replace-lo0-address-on-solaris-v9_12 in 7 minutes and 45 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Precheck
passed #25129
amd64 docker linux
precheck:debian:sid:amd64

00:00:14

 
  Build
passed #25130
amd64 docker linux
build:centos:centos6:amd64

00:02:12

passed #25131
amd64 docker linux
build:centos:centos7:amd64

00:02:21

passed #25132
amd64 docker linux
build:debian:sid:amd64

00:01:39

passed #25133
i386 docker linux
build:debian:sid:i386

00:01:41

 
  Test
passed #25138
amd64 docker linux
systemtest:centos:centos6:amd64

00:04:52

passed #25139
amd64 docker linux
systemtest:centos:centos7:amd64

00:04:53

passed #25140
amd64 docker linux
systemtest:debian:sid:amd64

00:04:55

passed #25141
i386 docker linux
systemtest:debian:sid:i386

00:05:08

passed #25134
amd64 docker linux
unittest:centos:centos6:amd64

00:01:03

passed #25135
amd64 docker linux
unittest:centos:centos7:amd64

00:01:04

passed #25136
amd64 docker linux
unittest:debian:sid:amd64

00:00:53

passed #25137
i386 docker linux
unittest:debian:sid:i386

00:00:57