Add os-log-merger package
Add os-log-merger package

os-log-merger provides linear time log aggregation for openstack
and other logs format.

It's an extremely useful tool to debug logs, and go through sosreports.

The associated package review request for this is below:

Package Review: os-log-merger
https://bugzilla.redhat.com/1633257

Change-Id: Iea52840808b8be1e3483f7448a36eac15054e383

javierpena/rdoinfo,redhat-openstack/rdoinfo