redis: use local sockets by default in sonic-db-cli

[ashutosh-agrawal]

What I did

• Changed sonic-db-cli to use the configured Unix socket for local databases by default.
• Kept TCP for redis_chassis.server and database entries that do not have a Unix socket.
• Added -t / --tcp as an explicit TCP override.
• Kept the existing -s / --unixsocket behavior.

Why I did it

Local sonic-db-cli calls should keep working after the local Redis TCP listener is disabled. The CLI already has the socket, host, and port for each database, so it can make the choice directly without adding a shared resolver to swss-common.

This change leaves chassis and remote database entries on TCP while moving ordinary local and namespace database calls to Unix sockets.

How I verified it

• Confirmed that the diff is limited to sonic-db-cli and its existing help-output fixture.
• Confirmed that the commit passes the DCO check.
• Local tests were not run for this draft. Automated checks are pending on the new head.

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