Support dynamic ip address in interface test

[tomoyk]

Describe the feature:

Currently, dynamic IP address testing is not supported in interface section.

Please support CIDR-based IP address testing.

Describe the solution you'd like

Example format:

interface:
  eth0:
    # required attributes
    exists: true
    # optional attributes
    addrs-range:
    - 172.17.0.0/16
    - 10.0.0.0/8
    mtu: 1500

Describe alternatives you've considered

It can also be expressed in the command section.

command:
  ipaddr:
    exit-status: 0
    exec: 'ip -f inet -o addr show eth0 | grep -o "inet 10.[0-9]\{1,3\}.[0-9]\{1,3\}.[0-9]\{1,3\}"'
    timeout: 10000 # in milliseconds
    skip: false

[aelsabbahy]

I think this would be great once the #576 lands. At that point, there can be a custom matcher cidr-constraint or something like that.

[tomoyk]

Thank you for handling this issue 👍