remove "get_agents" rule in policy.json
remove "get_agents" rule in policy.json

Bug #1200933

keep the current API behaviour due to compatibility
and leave list op authz in new API version.

Change-Id: Ia0a9b8738fa8ffe913d2e2b1ef28232abb18340d

gkotton/vmware-nsx,gkotton/vmware-nsx