Secure Redis connection between ks-apiserver

Created by: RolandMa1986

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR enables Redis authentication by default. Ks-apiserver will use secure connections.

Redis' password will be generated randomly and saved into` redis-secret both ks-apiserver and Redis will mount it into environment variables.

There's a health check issue that was fixed in the redis-ha helm chart when authentication was enabled.

Which issue(s) this PR fixes:

Fixes # kubesphere#4045 (closed)