Support for Internal LB In shared networks in advanced zone.

##### ISSUE TYPE
* Feature

##### COMPONENT NAME
* Internal LB

##### CLOUDSTACK VERSION
* CloudStack 4.17.1.0

##### CONFIGURATION
The cloudstack env is **using the Ceph RBD and local storage as cloudstack cluster primary storage** and using shared networks in advanced zone which is in https://github.com/apache/cloudstack/issues/5462

The cloudstack cluster TEST work node is eno49 and eno50 to bond0.
```
- bond0 ---> bond0.1935 ---> cloudbr0

-------> VLAN 1115
- bond0 ---> cloudbr1 -
-------> VLAN 1118

```

Now we can create the guest instance in VLAN 1115 and VLAN 1118. But in this mode I can not fount how to use the *Internal LB* service,

1. Cloud you please explan does this situation support the Internal LB?
2. If supported, How to use the *Internal LB* service?


The issue names no files, tests, or code entry points. Start by determining how Internal LB is expected to work with shared networks in an advanced zone; done should establish whether this configuration is supported and provide usage steps or a defined implementation scope.

Written by the indexing model from the issue text.