T5423: Fix for op-mode show vpn ike secrets

[sever-sever]

Change Summary

We don't use ipsec.secrets anymore
Fix op-mode for "show vpn ike secrets".
Ability to get "RAW" format

(cherry picked from commit 9732692)

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)

• https://vyos.dev/T5423

Component(s) name

ipsec op mode

Proposed changes

How to test

VyOS configuration:

set vpn ipsec authentication psk one id '192.0.2.1'
set vpn ipsec authentication psk one id '192.0.2.2'
set vpn ipsec authentication psk one secret 'SSSeeccRetT'
set vpn ipsec authentication psk two id '192.0.2.22'
set vpn ipsec authentication psk two secret 'se123cret'

Before the fix:

vyos@r14:~$ show vpn ike secrets 
cat: /etc/ipsec.secrets: No such file or directory
vyos@r14:~$

After the fix:

vyos@r14:~$ show vpn ike secrets 
PSK    Id          Secret
-----  ----------  -----------
one    192.0.2.1   SSSeeccRetT
       192.0.2.2
two    192.0.2.22  se123cret
vyos@r14:~$ 

RAW:

vyos@r14:~$ /usr/libexec/vyos/op_mode/ipsec.py show_psk --raw
[
    {
        "id": [
            "192.0.2.1",
            "192.0.2.2"
        ],
        "secret": "SSSeeccRetT",
        "psk": "one"
    },
    {
        "id": [
            "192.0.2.22"
        ],
        "secret": "se123cret",
        "psk": "two"
    }
]
vyos@r14:~$

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