remove required/default comments
remove required/default comments

with the move to names instead of UUIDs, we can provide sane defaults
for just about everything other than the ssh key.

Change-Id: Id37465925ef42a88c5c7a74e570dbe50164fa5da

jamesmarva/heat-kubernetes,yuanying/heat-kubernetes,larsks/heat-kubernetes,projectatomic/heat-kubernetes,v1k0d3n/heat-kubernetes,mdshuai/heat-kubernetes,rootfs/heat-kubernetes