system_login: T6807: allow a trailing slash character in system login

[aslanvyos]

Allow the use of a trailing slash ("/") at the of the user's home directory path. For example /home/test/

Change Summary

After the migration VyOS version from 1.3.x to 1.4.0, the presence of a trailing slash ("/") at the end of the user's home directory path beaks the login 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)

Related PR(s)

Component(s) name

Proposed changes

After migrating from VyOS version 1.3.x to 1.4.0, the presence of a trailing slash ("/") at the end of the user's home directory path breaks the login process. This issue affects both login/password authentication and SSH key-based access, making it impossible for users to log in to VyOS instances.
To resolve this issue, I propose allowing the use of a trailing slash ("/") in the home directory path. This change will ensure that users do not encounter login problems after future migrations.

Examples of Allowed Paths:

• With Trailing Slash: /home/test/
• Without Trailing Slash: /home/test

Examples of Disallowed Paths:

• //home/test/ (contains double slashes)
• /home//test (contains double slashes)
• home/test/ (does not start with a slash)

How to test

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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