just for completeness sake, if you need to find out what the privileges names are you can do this (after succesfully connecting to an esx host as a user with the administrator role):

use Data::Dumper;

my $host_view = Vim::find_entity_view(view_type => 'HostSystem');

my $content = Vim::get_service_content();

my $authMgr = Vim::get_view(mo_ref => $content->authorizationManager);

my $rolelist = $authMgr->roleList;

print Dumper $rolelist;

This might save you some frustration time