firewall: T6257: Show member information for dynamic groups in op-mode (backport #3369)

[mergify]

Change Summary

Show member information for dynamic groups in op-mode

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

Related PR(s)

Component(s) name

op-mode, firewall

Proposed changes

How to test

vyos@vyos# run show firewall group
Firewall Groups

Name    Type                    References            Members          Timeout    Expires
------  ----------------------  --------------------  -------------  ---------  ---------
TEST    address_group           N/D                   127.0.0.1
DYN-01  address_group(dynamic)  ipv4-input-filter-10  192.168.77.39         10          1
DYN-02  address_group(dynamic)  ipv4-input-filter-20  192.168.0.245        120        104
                                                      192.168.77.39        120        117
                                                      192.168.77.40        120        117

vyos@vyos# run show firewall group detail
Firewall Groups

 Name        | TEST
 Description |
 Type        | address_group
 References  | N/D
 Members     | 127.0.0.1

 Name        | DYN-01
 Description |
 Type        | address_group(dynamic)
 References  | ipv4-input-filter-10
 Members     | 192.168.77.39 (timeout: 10, expires: 1)

 Name        | DYN-02
 Description |
 Type        | address_group(dynamic)
 References  | ipv4-input-filter-20
 Members     | 192.168.0.245 (timeout: 120, expires: 96)
             | 192.168.77.39 (timeout: 120, expires: 109)
             | 192.168.77.40 (timeout: 120, expires: 109)

Smoketest result

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

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This is an automatic backport of pull request #3369 done by [Mergify](https://mergify.com).