add upgrade.yml content for gnocchi role
add upgrade.yml content for gnocchi role

Closes-bug: #1626952

Change-Id: Ib94635d3322dfc31c1dc31fec1ca1eac4f55dedb

GalenMa/kolla,GalenMa/kolla,mandre/kolla,nihilifer/kolla,mrangana/kolla,stackforge/kolla,rahulunair/kolla,mandre/kolla,intel-onp/kolla,openstack/kolla,rahulunair/kolla,mrangana/kolla,stackforge/kolla,dardelean/kolla-ansible,openstack/kolla,coolsvap/kolla,nihilifer/kolla,coolsvap/kolla,intel-onp/kolla,mandre/kolla,coolsvap/kolla,dardelean/kolla-ansible,stackforge/kolla,dardelean/kolla-ansible