This patch provides the option to override
the value sourceName field in the VES event generated by
the vG-MUX VES agent. The value can be configured
by vppctl CLI command or via honeycomb REST call.
Change-Id: I1a8b0450b989391b39780476842a576b82564dff
Issue-ID: INT-63 Signed-off-by: Eric Multanen <eric.w.multanen@intel.com>