There are cases when one may update edge_ha mode or change
hostgroups or want to rebalance things.
Here the admin should do the following:
1. Clean the host groups
2. Create all
For example:
nsxadmin -r edges -o nsx-update --property hostgroup=clean
nsxadmin -r edges -o nsx-update --property hostgroup=all
Change-Id: I4d4302f87e9c8dceaf16e960d0e5c705331088ca
54682e5ca1