spec: when using test-queue, don't truncate tables in main process

we're going to do it again after fork anyway, so it's redundant

Change-Id: Iede3160a8daf63869a42505bbec0496c12336912
Reviewed-on: https://gerrit.instructure.com/100875
Tested-by: Jenkins
Reviewed-by: Landon Wilkins <lwilkins@instructure.com>
Product-Review: Landon Wilkins <lwilkins@instructure.com>
QA-Review: Landon Wilkins <lwilkins@instructure.com>

spec/spec_helper.rb

@@ -52,6 +52,7 @@ Dir[Rails.root.join("spec/support/**/*.rb")].each { |f| require f }
 # and then ensure people aren't creating records outside the rspec
 # lifecycle, e.g. inside a describe/context block rather than a
 # let/before/example
+BlankSlateProtection.truncate_all_tables! unless defined?(TestQueue::Runner::RSpec) # we do this in each runner
 BlankSlateProtection.install!
 
 ActionView::TestCase::TestController.view_paths = ApplicationController.view_paths

spec/support/blank_slate_protection.rb

@@ -48,7 +48,6 @@ module BlankSlateProtection
     end
 
     def install!
-      truncate_all_tables!
       ::RSpec::Core::Example.prepend Example
       ::ActiveRecord::Base.include ActiveRecord
       @enabled = true