Pacemaker-1.1.21-rc1

• Changes since Pacemaker-1.1.20
  • Important security fixes for CVE-2018-16878, CVE-2018-16877, CVE-2019-3885
  • tools: ensure crm_resource --clean-up works with multiple failures (regression in 1.1.20)
  • build: crm_report bug report URL is now configurable at build time
  • crmd: avoid memory leak when duplicate monitor is scheduled
  • pengine: respect order constraints when resources are being probed
  • pengine: one group stop shouldn't make another required
  • pengine: silence log message about symmetrical property of serialize orders
  • libcrmcommon: handle out-of-range integers in configuration better
  • libcrmservice: fix use-after-free memory error in alert handling