map_instances only needs to be run during the transition from
Newton to Ocata to map existing instances into a cell. All
new Ocata instances will be automatically mapped to a call.
This change limits the slow running map_instances command to
just run for upgrades to Ocata
Change-Id: Ic2e2df530504284d28cfcab26a71d211342203fa
Closes-Bug: #1743357