kexec-tools is required and kdump.conf is used by
puppet-manifests in stx 5.0, so
* Add kexec-tools into image
* Add the config files used by puppet-manifests
from kexec-tools-2.0.15-21.el7.src.rpm
Story: 2008952
Task: 42576
Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Change-Id: I5d8c3898bfc8cbb6fb48e10e789e24c1d8e0aa26