Adding port so keyring is not overwritten

[bechampion]

Description

Keys in keychain are overwritten when same user/host is used (this happens a lot when you proxy over ssh where the host is always localhost and username pretty much is always the same)

Before change

After change

Checklist

• I've added this contribution to the changelog.rst.
• I've added my name to the AUTHORS file (or it's already there).

• I installed pre-commit hooks (pip install pre-commit && pre-commit install).
• Please squash merge this pull request (uncheck if you'd like us to merge as multiple commits)

[DiegoDAF]

Yep, nice. Good catch.

[DiegoDAF]

Thinking again, I could recommend user@host:port to be more like in ssh (or even pgpass format with colon)

And, maybe, or not, a "legacy" idea to try with the old format.

key_with_port = f"{user}@{host}:{port}"
passwd = auth.keyring_get_password(key_with_port)

if not passwd:
    key_legacy = f"{user}@{host}"
    passwd = auth.keyring_get_password(key_legacy)

# and ofc, save it in the new type with port
if passwd:
        auth.keyring_set_password(key_with_port, passwd)

[j-bennet]

@DiegoDAF I think it's ok to not try for backwards compatibility in this case.