DEV: Attempt to stablize multisite tests.

spec/multisite/distributed_cache_spec.rb

@@ -9,6 +9,7 @@ RSpec.describe 'Multisite SiteSettings' do
 
   after do
     conn.clear_settings!
+    ActiveRecord::Base.establish_connection
   end
 
   def cache(name, namespace: true)

spec/multisite/jobs_spec.rb

@@ -9,6 +9,7 @@ RSpec.describe "Running Sidekiq Jobs in Multisite" do
 
   after do
     conn.clear_settings!
+    ActiveRecord::Base.establish_connection
   end
 
   it 'should revert back to the default connection' do

spec/multisite/site_settings_spec.rb

@@ -16,6 +16,7 @@ RSpec.describe 'Multisite SiteSettings' do
 
     conn.clear_settings!
     SiteSetting.provider = @original_provider
+    ActiveRecord::Base.establish_connection
   end
 
   describe '#default_locale' do