Put debug options in debug_otions

This depends on https://github.com/travis-ci/travis-migrations/pull/7

lib/travis/api/v3/models/job.rb

@@ -9,5 +9,6 @@ module Travis::API::V3
     belongs_to :build, autosave: true, foreign_key: 'source_id'
     belongs_to :owner, polymorphic: true
     serialize :config
+    serialize :debug_options
   end
 end

lib/travis/api/v3/services/job/debug.rb

@@ -10,7 +10,7 @@ module Travis::API::V3
       raise WrongCredentials unless Travis.config.debug_tools_enabled or Travis::Features.active?(:debug_tools, job.repository)
       access_control.permissions(job).debug!
 
-      job.config.merge! debug_data
+      job.debug_options = debug_data
       job.save!
 
       query.restart(access_control.user)
@@ -19,13 +19,11 @@ module Travis::API::V3
 
     def debug_data
       {
-        debug: {
         stage: 'before_install',
         previous_state: job.state,
         created_by: access_control.user.login,
         quiet: params["quiet"] || false
       }
-      }
     end
   end
 end