Add ability to specify password for the redis server

Author: gurustephen

src/LaunchDarkly/Impl/Integrations/PHPRedisFeatureRequester.php

@@ -31,7 +31,8 @@ public function __construct($baseUri, $sdkKey, $options)
             $this->_redisOptions = [
                 "timeout" => $options['redis_timeout'] ?? 5,
                 "host" => $options['redis_host'] ?? 'localhost',
-                "port" => $options['redis_port'] ?? 6379
+                "port" => $options['redis_port'] ?? 6379,
+                "password" => $options['redis_password'] ?? null
             ];
         }
     }
@@ -65,6 +66,12 @@ protected function getConnection()
             $this->_redisOptions["timeout"],
             'launchdarkly/php-server-sdk-redis-phpredis'
         );
+        if (
+            $this->_redisOptions['password'] !== null &&
+            $this->_redisOptions['password' !== '']
+        ) {
+            $redis->auth($this->_redisOptions['password']);
+        }
         return $this->_redisInstance = $redis;
     }
 }

src/LaunchDarkly/Integrations/PHPRedis.php

@@ -24,6 +24,7 @@ class PHPRedis
      * @param array $options  Configuration settings (can also be passed in the main client configuration):
      *   - `redis_host`: hostname of the Redis server; defaults to `localhost`
      *   - `redis_port`: port of the Redis server; defaults to 6379
+     *   - `redis_password`: password to auth against the Redis server; optional
      *   - `redis_timeout`: connection timeout in seconds; defaults to 5
      *   - `redis_prefix`: a string to be prepended to all database keys; corresponds to the prefix
      * setting in ld-relay