Change default path of kubecluster.yaml to absolute one.
Change default path of kubecluster.yaml to absolute one.

Currently the default path of template file
kubecluster.yaml was relative path. Due to which
magnum-conductor failed to start even if the file
exist. It was because os.path.isfile works with
absolute path only. Hence changing the default
value to absolute path.

Change-Id: I9acbd21cf178a1beee5df30389902577fefc6e48
Closes-bug: #1427069

ramielrowe/magnum,eshijia/SUR,ChengTiesheng/magnum,Tennyson53/magnum,Tennyson53/SUR,openstack/magnum,mjbrewer/testindex,ffantast/magnum,paulczar/magnum,hongbin/magnum,ArchiFleKs/magnum,eshijia/magnum,Tennyson53/SUR,eshijia/magnum,LaynePeng/magnum,ChengTiesheng/magnum,ddepaoli3/magnum,hongbin/magnum,eshijia/SUR,ffantast/magnum,mjbrewer/testindex,ramielrowe/magnum,annegentle/magnum,ArchiFleKs/magnum,Alzon/SUR,jay-lau/magnum,mjbrewer/testindex,Alzon/SUR,annegentle/magnum,paulczar/magnum,Tennyson53/magnum,LaynePeng/magnum,sajuptpm/magnum,openstack/magnum,dimtruck/magnum,dimtruck/magnum,ddepaoli3/magnum,sajuptpm/magnum