Adding support for manually configured fence_kdump

[Martin Perina]

Hi,

we want to integrate support for fence_kdump into oVirt project. Marek Grac pointed me
to kexec-tools-2.0.4-23 which contains automatic configuration of fence_kdump from Pacemaker config.
Unfortunately for us, this support is tightly bound to Pacemaker, so I created attached patch,
which adds support for manual configuration of fence_kdump:

1) Current status without this patch (kexec-tools-2.0.4-23)
     - when running 'kdumpctl restart' kdump detects if fence_kdump_send command is installed
       and if so, it tries to:

         a) Create /etc/sysconfig/fence_kdump file with command line parameters for fence_kdump_send.
            These parameters are extracted from cluster configuration using 'pcs cluster' command
         b) Create /etc/fence_kdump_nodes file with list of hosts to send fence_kdump notification to.
            These hosts are also extracted from cluster configuration using 'pcs cluster' command
         c) If these two files are successfully created, kdump tries to configure network to be able
            to reach all hosts defined in /etc/fence_kdump_nodes
         d) Install these two config files into kdump's kernel initramfs


2) Behavior with this patch
     - when running 'kdumpctl restart' kdump detect if fence_kdump_send binary is installed
       and if so, it tries to:

         a) It tries to detect is cluster is configured ('pcs' command is available). If so, it creates
            needed config files as described above in steps 1a) and 1b)
         b) If cluster is not configured, it tries to detect if /etc/sysconfig/fence_kdump and
            /etc/sysconfig/fence_kdump_nodes exist. If so, fence_kdump is marked as successfully
            configured and kdump continues with steps 1c) and 1d)


Is it possible to integrate such patch into kexec-tools RPM?

We would like to integrate fence_kdump support into oVirt 3.5 which should be released in May,
so before this to happen, we need kexec-tools RPM with this patch to be available for RHEL 6 and
Fedora 19/20.

Thanks

Martin Perina