[#934] container: Make container APE middleware read namespaces

* Those methods that can access already existing containers and thus
  can get container properties should read namespace from Zone
  property. If Zone is not set, take a namespace for root.
* Otherwise, define namespaces by owner ID via frostfs-id contract.
* Improve unit-tests, consider more cases.

Signed-off-by: Airat Arifullin <a.arifullin@yadro.com>

cmd/frostfs-node/config.go

@@ -449,6 +449,7 @@ type cfg struct {
 	cfgMorph          cfgMorph
 	cfgAccounting     cfgAccounting
 	cfgContainer      cfgContainer
+	cfgFrostfsID      cfgFrostfsID
 	cfgNodeInfo       cfgNodeInfo
 	cfgNetmap         cfgNetmap
 	cfgControlService cfgControlService
@@ -569,6 +570,10 @@ type cfgContainer struct {
 	workerPool  util.WorkerPool // pool for asynchronous handlers
 }
 
+type cfgFrostfsID struct {
+	scriptHash neogoutil.Uint160
+}
+
 type cfgNetmap struct {
 	scriptHash neogoutil.Uint160
 	wrapper    *nmClient.Client
@@ -681,6 +686,8 @@ func initCfg(appCfg *config.Config) *cfg {
 	}
 	c.cfgContainer = initContainer(appCfg)
 
+	c.cfgFrostfsID = initFrostfsID(appCfg)
+
 	c.cfgNetmap = initNetmap(appCfg, netState, relayOnly)
 
 	c.cfgGRPC = initCfgGRPC()
@@ -779,6 +786,12 @@ func initContainer(appCfg *config.Config) cfgContainer {
 	}
 }
 
+func initFrostfsID(appCfg *config.Config) cfgFrostfsID {
+	return cfgFrostfsID{
+		scriptHash: contractsconfig.FrostfsID(appCfg),
+	}
+}
+
 func initCfgGRPC() cfgGRPC {
 	maxChunkSize := uint64(maxMsgSize) * 3 / 4          // 25% to meta, 75% to payload
 	maxAddrAmount := uint64(maxChunkSize) / addressSize // each address is about 72 bytes