restapi: 'concurrent' Not Displayed For Primary PM Agent

When there's more than one Power-Management agents, the field
'concurrent' becomes relevant. Prior to this fix, this field
would only exist in the secondary agent. After this fix, this
field will also exist in the first agent

Change-Id: If0882d1db6c13b24c767e0cb40b9b797e8b61860
Bug-Url: http://bugzilla.redhat.com/977674
Signed-off-by: Ori Liel <oliel@redhat.com>