* notification.kafka: add SASL authentication and TLS support (#8827)
Wire sarama SASL (PLAIN, SCRAM-SHA-256, SCRAM-SHA-512) and TLS
configuration into the Kafka notification producer and consumer,
enabling connections to secured Kafka clusters.
* notification.kafka: validate mTLS config
* kafka notification: validate partial mTLS config, replace panics with errors
- Reject when only one of tls_client_cert/tls_client_key is provided
- Replace three panic() calls in KafkaInput.initialize with returned errors
* kafka notification: enforce minimum TLS 1.2 for Kafka connections
The io/ioutil package has been deprecated as of Go 1.16, see
https://golang.org/doc/go1.16#ioutil. This commit replaces the existing
io/ioutil functions with their new definitions in io and os packages.
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
