Merge pull request #7452 from arunagw/memcached_dalli

Memcached to dalli for actionpack test.

actionpack/lib/action_dispatch/middleware/session/mem_cache_store.rb

 require 'action_dispatch/middleware/session/abstract_store'
-require 'rack/session/memcache'
+require 'rack/session/dalli'
 
 module ActionDispatch
   module Session
-    class MemCacheStore < Rack::Session::Memcache
+    class MemCacheStore < Rack::Session::Dalli
       include Compatibility
       include StaleSessionCheck
       include SessionObject
 
       def initialize(app, options = {})
-        require 'memcache'
+        require 'dalli'
         options[:expire_after] ||= options[:expires]
         super
       end

actionpack/test/dispatch/session/mem_cache_store_test.rb

@@ -34,9 +34,9 @@ def call_reset_session
   end
 
   begin
-    require 'memcache'
-    memcache = MemCache.new('localhost:11211')
-    memcache.set('ping', '')
+    require 'dalli'
+    ss = Dalli::Client.new('localhost:11211').stats
+    raise Dalli::DalliError unless ss['localhost:11211']
 
     def test_setting_and_getting_session_value
       with_test_route_set do
@@ -165,7 +165,7 @@ def test_prevents_session_fixation
         assert_not_equal session_id, cookies['_session_id']
       end
     end
-  rescue LoadError, RuntimeError
+  rescue LoadError, RuntimeError, Dalli::DalliError
     $stderr.puts "Skipping MemCacheStoreTest tests. Start memcached and try again."
   end