ipsec prefix: T4275: Incorrect val_help for local/remote prefix in site-to-site ipsec vpn

[srividya0208]

Change Summary

It accepts network as the input value but the completion help is showing ip address

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://phabricator.vyos.net/T4275

Component(s) name

ipsec

Proposed changes

Previousconfig:

vyos@vyos# set vpn ipsec site-to-site peer x.x.x.x tunnel x local prefix
Possible completions:
   <x.x.x.x>    Local IPv4 prefix
   <h:h:h:h:h:h:h:h>
                Local IPv6 prefix

New config:

vyos@vyos# set vpn ipsec site-to-site peer x.x.x.x tunnel 1 local prefix
Possible completions:
   <x.x.x.x/x>  Local IPv4 prefix
   <h:h:h:h:h:h:h:h/x>
                Local IPv6 prefix

How to test

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