TLS: Do not require CA config if not used. (#7862)
TLS: Do not require CA config if not used. (#7862)

The tls-ca-cert or tls-ca-cert-dir configuration parameters are only
used when Redis needs to authenticate peer certificates, in one of these
scenarios:

1. Incoming clients or replicas, with `tls-auth-clients` enabled.
2. A replica authenticating the master's peer certificate.
3. Cluster nodes authenticating other nodes when establishing the bus
   protocol connection.
JackieXie168/redis,JackieXie168/redis,JackieXie168/redis,JackieXie168/redis