Remove workaround for puppet-redis + CentOS Stream 9

... because puppet-redis supports CentOS Stream 9 since v8.3.0 and
uses the correct file path automatically.

[1] 9d2e3fc5b6

Change-Id: I9d2d78fe98d3a6f820b5356a78f4cf599a6d6d27

manifests/redis.pp

@@ -1,27 +1,8 @@
 class openstack_integration::redis {
   include openstack_integration::config
 
-  # TODO(tkajinam): Remove this once puppet-redis supports CentOS 9
-  case $::osfamily {
-    'Debian': {
-      $redis_config   = '/etc/redis/redis.conf'
-    }
-    'RedHat': {
-      if versioncmp($::operatingsystemmajrelease, '8') > 0 {
-        $redis_config = '/etc/redis/redis.conf'
-      } else {
-        $redis_config = '/etc/redis.conf'
-      }
-    }
-    default: {
-      fail("redis.pp manifest does not support family: ${::osfamily}")
-    }
-  }
-
   class { 'redis':
-    bind             => $::openstack_integration::config::host,
-    config_file      => $redis_config,
-    config_file_orig => "${redis_config}.puppet",
-    ulimit_managed   => false,
+    bind           => $::openstack_integration::config::host,
+    ulimit_managed => false,
   }
 }