Inconsistency in SSL password support between Synchronous and Asynchronous Redis clients

[sujithdubbaka]

Version: What redis-py and what redis version is the issue happening on?
All
Platform: What platform / version? (For example Python 3.5.1 on Windows 7 / Ubuntu 15.10 / Azure)
All
Description: Description of your issue, stack traces from errors and code that reproduces the issue
I have been working with the Redis Asyncio library and I have encountered an issue while try to establish a new connection, it prompts me to 'Enter PEM passphrase'. In my case I am working with password encrypted SSL private keys. Currently, the Redis asynchronous client (redis asyncio) does not support SSL passwords while the synchronous Redis client supports SSL passwords.

[github-actions]

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[petyaslavova]

Fixed with #3878