Clean Redis::SharedState constants

- Use Redis::Sessions constants instead

app/models/active_session.rb

@@ -125,15 +125,15 @@ class ActiveSession
   end
 
   def self.rack_key_name(session_id)
-    "#{redis_store_class::SESSION_NAMESPACE}:#{session_id}"
+    "#{Gitlab::Redis::Sessions::SESSION_NAMESPACE}:#{session_id}"
   end
 
   def self.key_name(user_id, session_id = '*')
-    "#{redis_store_class::USER_SESSIONS_NAMESPACE}:#{user_id}:#{session_id}"
+    "#{Gitlab::Redis::Sessions::USER_SESSIONS_NAMESPACE}:#{user_id}:#{session_id}"
   end
 
   def self.lookup_key_name(user_id)
-    "#{redis_store_class::USER_SESSIONS_LOOKUP_NAMESPACE}:#{user_id}"
+    "#{Gitlab::Redis::Sessions::USER_SESSIONS_LOOKUP_NAMESPACE}:#{user_id}"
   end
 
   def self.list_sessions(user)

config/initializers/session_store.rb

@@ -25,7 +25,7 @@ store = if Gitlab::Utils.to_boolean(ENV['GITLAB_USE_REDIS_SESSIONS_STORE'], defa
           )
         else
           Gitlab::Redis::SharedState.store(
-            namespace: Gitlab::Redis::SharedState::SESSION_NAMESPACE
+            namespace: Gitlab::Redis::Sessions::SESSION_NAMESPACE
           )
         end
 

lib/gitlab/redis/shared_state.rb

@@ -3,10 +3,6 @@
 module Gitlab
   module Redis
     class SharedState < ::Gitlab::Redis::Wrapper
-      SESSION_NAMESPACE = 'session:gitlab'
-      USER_SESSIONS_NAMESPACE = 'session:user:gitlab'
-      USER_SESSIONS_LOOKUP_NAMESPACE = 'session:lookup:user:gitlab'
-      IP_SESSIONS_LOOKUP_NAMESPACE = 'session:lookup:ip:gitlab2'
     end
   end
 end

lib/tasks/gitlab/cleanup.rake

@@ -102,7 +102,7 @@ namespace :gitlab do
       task active_sessions_lookup_keys: :gitlab_environment do
         use_redis_session_store = Gitlab::Utils.to_boolean(ENV['GITLAB_USE_REDIS_SESSIONS_STORE'], default: true)
         redis_store_class = use_redis_session_store ? Gitlab::Redis::Sessions : Gitlab::Redis::SharedState
-        session_key_pattern = "#{redis_store_class::USER_SESSIONS_LOOKUP_NAMESPACE}:*"
+        session_key_pattern = "#{Gitlab::Redis::Sessions::USER_SESSIONS_LOOKUP_NAMESPACE}:*"
         last_save_check = Time.at(0)
         wait_time = 10.seconds
         cursor = 0