varz subscriptions count is only for global account

[ripienaar]

Running 0bdd8f8 I note that the varz subscriptions count is always 1:

$ nats server req varz --user system|jq '{"git": .data.git_commit, "subscriptions": .data.subscriptions}'
{
  "git": "0bdd8f84",
  "subscriptions": 1
}

While from subsz we have correct values:

% nats server req subsz --user system|jq .data.num_subscriptions
3877

[ripienaar]

Appears to me we only consider global account subscriptions. This lines up since I recently moved all my connections out of $G and the stats dropped to 1

nats-server/server/monitor.go

Lines 1371 to 1372 in 4334e34

	// FIXME(dlc) - make this multi-account aware.
	v.Subscriptions = s.gacc.sl.Count()

Where subsz will loop all the accounts and add it all up

nats-server/server/monitor.go

Lines 908 to 915 in 4334e34

	s.accounts.Range(func(k, v interface{}) bool {
	acc := v.(*Account)
	if filterAcc != "" && acc.GetName() != filterAcc {
	return true
	}
	slStats.add(acc.sl.Stats())
	return true
	})

[ripienaar]

#2074