Update `rails_multisite` to 2.0.1.

Gemfile.lock

@@ -275,7 +275,7 @@ GEM
       nokogiri (>= 1.6)
     rails-html-sanitizer (1.0.3)
       loofah (~> 2.0)
-    rails_multisite (1.1.2)
+    rails_multisite (2.0.1)
       activerecord (> 4.2, < 6)
       railties (> 4.2, < 6)
     railties (5.1.4)

config/initializers/014-rails_multisite.rb

@@ -12,8 +12,8 @@ end
 
 if Rails.configuration.multisite
   Rails.configuration.middleware.swap(
-    RailsMultisite::ConnectionManagement,
-    RailsMultisite::ConnectionManagement,
+    RailsMultisite::Middleware,
+    RailsMultisite::Middleware,
     RailsMultisite::DiscoursePatches.config
   )
 end

spec/multisite/distributed_cache_spec.rb

@@ -5,18 +5,10 @@ RSpec.describe 'Multisite SiteSettings' do
 
   before do
     conn.config_filename = "spec/fixtures/multisite/two_dbs.yml"
-    conn.load_settings!
-    conn.remove_class_variable(:@@current_db)
   end
 
   after do
     conn.clear_settings!
-
-    [:@@db_spec_cache, :@@host_spec_cache, :@@default_spec].each do |class_variable|
-      conn.remove_class_variable(class_variable)
-    end
-
-    conn.set_current_db
   end
 
   def cache(name, namespace: true)

spec/multisite/jobs_spec.rb

@@ -5,18 +5,11 @@ RSpec.describe "Running Sidekiq Jobs in Multisite" do
 
   before do
     conn.config_filename = "spec/fixtures/multisite/two_dbs.yml"
-    conn.load_settings!
-    conn.remove_class_variable(:@@current_db)
+    SiteSetting.defaults.refresh_site_locale!
   end
 
   after do
     conn.clear_settings!
-
-    [:@@db_spec_cache, :@@host_spec_cache, :@@default_spec].each do |class_variable|
-      conn.remove_class_variable(class_variable)
-    end
-
-    conn.set_current_db
   end
 
   it 'should revert back to the default connection' do

spec/multisite/site_settings_spec.rb

@@ -7,8 +7,6 @@ RSpec.describe 'Multisite SiteSettings' do
     @original_provider = SiteSetting.provider
     SiteSetting.provider = SiteSettings::DbProvider.new(SiteSetting)
     conn.config_filename = "spec/fixtures/multisite/two_dbs.yml"
-    conn.load_settings!
-    conn.remove_class_variable(:@@current_db)
   end
 
   after do
@@ -17,12 +15,6 @@ RSpec.describe 'Multisite SiteSettings' do
     end
 
     conn.clear_settings!
-
-    [:@@db_spec_cache, :@@host_spec_cache, :@@default_spec].each do |class_variable|
-      conn.remove_class_variable(class_variable)
-    end
-
-    conn.set_current_db
     SiteSetting.provider = @original_provider
   end