Refactoring: Split up RSpec rails_helper into separate support files.

spec/support/perform_package_migrations.rb

@@ -0,0 +1,2 @@
+# make sure that all migrations of linked packages are executed
+Package::Migration.linked

spec/support/time_helper.rb

@@ -0,0 +1,9 @@
+RSpec.configure do |config|
+  # make usage of time travel helpers possible
+  config.include ActiveSupport::Testing::TimeHelpers
+
+  # avoid stuck time issues
+  config.after(:each) do
+    travel_back
+  end
+end

spec/support/webmock.rb

@@ -1,6 +1,8 @@
 # allow requests to:
 # - Zammad webservices
 # - Google (calendar)
+# - exchange.example.com (MS Exchange TCR mocks)
+# - localhost (Selenium server control)
 allowed_sites = lambda do |uri|
   ['zammad.com', 'google.com', 'exchange.example.com'].any? do |site|
     uri.host.include?(site)