Elimina el plugin Redmine Git Hosting

Finalmente se descarta por los problemas de configuración y potencial
brecha de seguridad al requerir acceso global al puerto ssh.

plugins/redmine_git_hosting/app/models/protected_branches_member.rb

@@ -1,24 +0,0 @@
-class ProtectedBranchesMember < ActiveRecord::Base
-  include Redmine::SafeAttributes
-
-  ## Attributes
-  safe_attributes 'principal_id', 'inherited_by'
-
-  ## Relations
-  belongs_to :protected_branch, class_name: 'RepositoryProtectedBranche'
-  belongs_to :principal
-
-  ## Callbacks
-  after_destroy :remove_dependent_objects
-
-  private
-
-  def remove_dependent_objects
-    return unless principal.class.name == 'Group'
-
-    principal.users.each do |user|
-      member = self.class.find_by_principal_id_and_inherited_by(user.id, principal.id)
-      member.destroy! unless member.nil?
-    end
-  end
-end