In tests, make initializing store/, its switchboard and an account more consistent.

Initialize store and switchboard first, then open account, and close in reverse
order.

Replace all "CheckClosed" calls with "WaitClosed", future changings will keep
an account reference open for a bit after the last regular close, so we can't
know that an account should be closed during tests.

Remove one parameter from the (still too long) "start test server" function in
imapserver testing code.

queue/queue_test.go

@@ -61,18 +61,20 @@ func setup(t *testing.T) (*store.Account, func()) {
 	mox.Context = ctxbg
 	mox.ConfigStaticPath = filepath.FromSlash("../testdata/queue/mox.conf")
 	mox.MustLoadConfig(true, false)
+	mox.Shutdown, mox.ShutdownCancel = context.WithCancel(ctxbg)
 	err := Init()
 	tcheck(t, err, "queue init")
 	err = mtastsdb.Init(false)
 	tcheck(t, err, "mtastsdb init")
 	err = tlsrptdb.Init()
 	tcheck(t, err, "tlsrptdb init")
+	switchStop := store.Switchboard()
+
 	acc, err := store.OpenAccount(log, "mjl", false)
 	tcheck(t, err, "open account")
 	err = acc.SetPassword(log, "testtest")
 	tcheck(t, err, "set password")
-	switchStop := store.Switchboard()
-	mox.Shutdown, mox.ShutdownCancel = context.WithCancel(ctxbg)
+
 	return acc, func() {
 		acc.Close()
 		acc.WaitClosed()