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_11 in 6 minutes and 58 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Precheck
passed #25116
amd64 docker linux
precheck:debian:sid:amd64

00:00:13

 
  Build
passed #25117
amd64 docker linux
build:centos:centos6:amd64

00:01:59

passed #25118
amd64 docker linux
build:centos:centos7:amd64

00:02:09

passed #25119
amd64 docker linux
build:debian:sid:amd64

00:01:38

passed #25120
i386 docker linux
build:debian:sid:i386

00:01:47

 
  Test
passed #25125
amd64 docker linux
systemtest:centos:centos6:amd64

00:04:18

passed #25126
amd64 docker linux
systemtest:centos:centos7:amd64

00:04:21

passed #25127
amd64 docker linux
systemtest:debian:sid:amd64

00:04:27

passed #25128
i386 docker linux
systemtest:debian:sid:i386

00:04:34

passed #25121
amd64 docker linux
unittest:centos:centos6:amd64

00:01:06

passed #25122
amd64 docker linux
unittest:centos:centos7:amd64

00:01:09

passed #25123
amd64 docker linux
unittest:debian:sid:amd64

00:00:50

passed #25124
i386 docker linux
unittest:debian:sid:i386

00:00:48