read both ip address format in lan module

read uci option '192.168.1.1/24' as well as ip and separate netmask combination. Initial commit
8 jobs for read-ambigious-luci-lan-settings in 11 minutes and 11 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Test
passed #465189
blackbox_mock_mqtt

00:01:47

passed #465136
blackbox_openwrt_mqtt

00:09:23

passed #465137
blackbox_openwrt_ubus

00:09:00

passed #465134
blackbox_openwrt_unix_socket

00:08:41

passed #465132
flake8

00:01:06

passed #465138
sample_module

00:01:46

passed #465133
unit_tests

00:01:57

failed #465135
blackbox_mock_mqtt

01:00:00