stack/erp5: Remove orphan file and corresponding hash section.

Should have been part of:
  commit c787d04c
  Author: Hardik Juneja <hardik.juneja@nexedi.com>
  Date:   Thu Jun 8 18:39:28 2017 +0200

      remove unnecessary monitor_template section form erp5 stack
4 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.SlapRunner.ResilienceTest-Master

00:23:57

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:25:02

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

06:12:52

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

04:37:01