fixes #10861 -remove unused columns from the hosts table

app/models/host/managed.rb

@@ -147,8 +147,6 @@ class Jail < ::Safemode::Jail
                           :if => Proc.new { |host| host.managed && host.pxe_build? && build? }
     validates :ptable_id, :presence => {:message => N_("can't be blank unless a custom partition has been defined")},
                           :if => Proc.new { |host| host.managed and host.disk.empty? and not Foreman.in_rake? and host.pxe_build? and host.build? }
-    validates :serial, :format => {:with => /[01],\d{3,}n\d/, :message => N_("should follow this format: 0,9600n8")},
-                       :allow_blank => true, :allow_nil => true
     validates :provision_method, :inclusion => {:in => PROVISION_METHODS, :message => N_('is unknown')}, :if => Proc.new {|host| host.managed?}
     validates :medium_id, :presence => true, :if => Proc.new { |host| host.validate_media? }
     validate :provision_method_in_capabilities

app/views/api/v1/hosts/show.json.rabl

@@ -6,7 +6,7 @@ attributes :name, :id, :ip, :environment_id, :last_report, :updated_at, :created
            :comment, :disk, :installed_at, :model_id, :hostgroup_id, :owner_id, :owner_type,
            :enabled, :puppet_ca_proxy_id, :managed, :use_image, :image_file, :uuid, :compute_resource_id,
            :puppet_proxy_id, :certname, :image_id, :created_at, :updated_at,
-           :last_compile, :last_freshcheck, :serial, :source_file_id, :puppet_status, :root_pass
+           :last_compile, :puppet_status, :root_pass
 
 if SETTINGS[:organizations_enabled]
   attribute :organization_id

app/views/api/v2/hosts/main.json.rabl

@@ -9,7 +9,7 @@ attributes :ip, :environment_id, :environment_name, :last_report, :mac, :realm_i
            :enabled, :puppet_ca_proxy_id, :managed, :use_image, :image_file, :uuid, :compute_resource_id, :compute_resource_name,
            :compute_profile_id, :compute_profile_name, :capabilities, :provision_method,
            :puppet_proxy_id, :certname, :image_id, :image_name, :created_at, :updated_at,
-           :last_compile, :last_freshcheck, :serial, :source_file_id, :puppet_status
+           :last_compile, :puppet_status
 
 if SETTINGS[:organizations_enabled]
   attributes :organization_id, :organization_name

db/migrate/20150618093433_remove_unused_fields_from_hosts.rb

@@ -0,0 +1,13 @@
+class RemoveUnusedFieldsFromHosts < ActiveRecord::Migration
+  def up
+    remove_index :hosts, :source_file_id
+    remove_columns :hosts, :last_freshcheck, :serial, :source_file_id
+  end
+
+  def down
+    add_column :hosts, :last_freshcheck, :datetime
+    add_column :hosts, :serial, :string, :limit => 255
+    add_column :hosts, :source_file_id, :integer
+    add_index :hosts, :source_file_id
+  end
+end