Add TLS Support to Redis Connection

[aaronmell]

Is your feature request related to a problem? Please describe.
Its not possible to use a redis password with AWS Elasticache because AWS requires TLS at transport to be enabled.

Describe the solution you'd like
Add a flag that will enabled tls
--redis-cache-enable-tls

You might also want to support, the following flags, although those are not needed in this case.
InsecureSkipVerify:
MinVersion:
RootCAs: