T4939: backport VRRP startup delay

[fett0]

Change Summary

this is a backport feature 1.4.X to VRRP , it would give more time/delay to start the process

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/T4939

Component(s) name

vrrp

Proposed changes

How to test

we would see this change in global_defs :

global_defs {
    dynamic_interfaces
    script_user root
    vrrp_startup_delay 60
    notify_fifo /run/keepalived/keepalived_notify_fifo
    notify_fifo_script /usr/libexec/vyos/system/keepalived-fifo.py
}

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

[sever-sever]

Did you check this test in 1.3 node?