To improve kubernetes support, update kernel to CentOS 7.5 version
and enable user namespaces in kernel bootargs.
Depends-On: https://review.openstack.org/580689
Change-Id: I4d8620ea17a19a764c6627cd79eb548c79c56bfd
Signed-off-by: Jason McKenna <jason.mckenna@windriver.com>
Story: 2002761
Task: 22841