Can commit without Password to Redis on Cloud (#577)

When we connect to Redis on Cloud, we generally do not need password and username. We can just be done with TLS.

So with the If check, we need to pass a dummy username and password, which is anyways not valid but the service starts as the server reject the password and goes ahead with TLS connection.

```
apiVersion: sources.knative.dev/v1alpha1
kind: RedisStreamSource
metadata:
  name: samplesource
  namespace: user1
spec:
  address: "rediss://default:password@amaaaaaa74akfsaami2pqxkiosy2gsfsv22fszx77pkb5yj2gemfbqj37lwa-p.redis.us-ashburn-1.oci.oraclecloud.com:6379"
  stream: teststream
  sink:
    ref:
      apiVersion: serving.knative.dev/v1
      kind: Service
      name: event-display
```

Co-authored-by: Amarendra Kumar <[email protected]>

pkg/source/adapter/adapter.go

@@ -237,7 +237,7 @@ func (a *Adapter) newPool(address string) *redis.Pool {
 		// configuring a connection.
 		Dial: func() (redis.Conn, error) {
 			var c redis.Conn
-			if opt.Password != "" && a.config.TLSCertificate != "" {
+			if a.config.TLSCertificate != "" {
 				roots := x509.NewCertPool()
 				ok := roots.AppendCertsFromPEM([]byte(a.config.TLSCertificate))
 				if !ok {