re-add ManagementNodeReadyExtensionPoint for ConsoleManager
<zstack:plugin>
<zstack:extension interface="org.zstack.header.Component" />
<zstack:extension interface="org.zstack.header.console.ConsoleBackend" />
+ <zstack:extension interface="org.zstack.header.managementnode.ManagementNodeReadyExtensionPoint" />
</zstack:plugin>
<property name="agentPort" value="${ManagementServerConsoleProxyBackend.agentPort:7758}" />
