Fix password parsing error when redis-sentinel URI contains @

[coolbeevip]

Make sure that:

• You have read the contribution guidelines.
• [] You have created a feature request first to discuss your contribution intent. Please reference the feature request ticket number in the pull request.
• You use the code formatters provided here and have them applied to your changes. Don’t submit any formatting related changes.
• You submit test cases (unit or integration tests) that back your changes.

Close #2254

[mp911de]

Thank you for your contribution. That's merged, polished, and backported now.