fence_kdump fails with "timeout after X seconds" in a RHEL 6 or 7 High Availability cluster with kexec-tools versions older than 2.0.14

Issue

• I need to capture a vmcore from a cluster node, but fence_kdump times out every time that node crashes.
• fence_kdump is failing with "timeout after 60 seconds" and the node gets fenced before the core is done
• If I test fence_kdump by panicking a node, fence_kdump fails with a time out error. If I take the node out of the cluster and panic it, it dumps a core successfully.