HVM Agent selects wrong address for private_ip_address

### problem

Hi.
In a advanced netowrk zone, VXLAN based, my KVM agents are using the storage network address as private ip address.

The network storage network is not routable between components, and it is causing severe problems like mal function on CPVM that try to connect on the wrong address to establish a connection with the hypervisor VNC Port.

The storage address is correctly found.

This is an exemple of my interfaces config:

```
root@hypr2-rck3:~# ip -br a
lo UNKNOWN 127.0.0.1/8 10.1.4.2/32 fd00:1337:1:4::2/128 ::1/128
ens8f0np0 DOWN
ens8f1np1 DOWN
ens5f0np0 UP 10.1.32.3/31 fd00:1337:1:20::3/127 fe80::e4f8:1110:2c37:62ca/64
ens5f1np1 DOWN
vxlan200 UNKNOWN
vxlan202 UNKNOWN
v-secstorbr@v-secstor UP
v-secstor@v-secstorbr UP 10.1.48.2/22 fd00:1337:1:2d::2/64 fe80::a6c6:ac43:1c4:ab35/64
v-clmgmtbr@v-clmgmt UP
v-clmgmt@v-clmgmtbr UP 10.1.0.2/22 fd00:1337:1::2/64 fe80::a535:f84c:40f1:b424/64
eth-clguest UNKNOWN
v-clstoragebr@v-clstorage UP
v-clstorage@v-clstoragebr UP 10.1.16.2/20 fd00:1337:1:10::2/64 fe80::e263:1ef4:9243:237e/64
br-secstor UP
eth-clpublic UNKNOWN
vxlan100 UNKNOWN
br-clmgmt UP
br-clguest UP
br-clstorage UP
br-clpublic UP
cloud0 UNKNOWN 169.254.0.1/16 fe80::d028:d0ff:fe30:3c0d/64
```

agent.properties
```
root@hypr2-rck3:~# cat /etc/cloudstack/agent/agent.properties
#Storage
#Tue Jun 30 18:10:35 BRT 2026
LibvirtComputingResource.id=6
LibvirtComputingResource.name=hypr2-rck3
LibvirtComputingResource.uuid=***
cluster=1
domr.scripts.dir=scripts/network/domr/kvm
guest.cpu.mode=custom
guest.cpu.model=Icelake-Server-noTSX
guest.network.device=br-clguest
guid=d46e7512-0114-378f-baf5-0c0683092c05
host=10.254.0.101,10.254.0.100@roundrobin
hypervisor.type=kvm
iscsi.session.cleanup.enabled=false
keystore.passphrase=****
local.storage.uuid=***
network.bridge.type=native
pod=1
port=8250
private.network.device=br-clmgmt
public.network.device=br-clpublic
resource=com.cloud.hypervisor.kvm.resource.LibvirtComputingResource
vm.migrate.wait=3600
vxlan.network.vtep.ip=10.1.4.2
workers=5
zone=2
```

The agent is selecting 10.1.16.2 address as storage (correct) and private (incorrect, the correct IP should be 10.1.0.2).

This range is directly routable. The agent can reach the management servers from this address, and the management servers can do stablish new connections with hosts too.

There is some property that I can change to enforce the private address?

### versions

Cloudstack 4.22.1.0
OS: Rocky Linux 10.2
Agent: 4.22.1.0
Java: OpenJDK 64-Bit Server VM (Red_Hat-21.0.11.0.10-1) (build 21.0.11+10-LTS, mixed mode, sharing)

### The steps to reproduce the bug

1. Setup a FRR / VXLAN / EVPN enviroment
2. Setup an advanced network zone in Cloudstack.
3. Adopt an hypervisor (using the correct ip address on the UI).
4. Adotion will work and hypervisor will be connected, able to run VMs, but with management IP incorrectly stored.

### What to do about it?

_No response_

从 agent.properties 中的 KVM agent 配置开始，重点查看 private.network.device 和入口 LibvirtComputingResource，然后跟踪在接管 hypervisor 期间如何选择接口地址。复现 FRR/VXLAN/EVPN 设置，并验证 br-clmgmt 选择 10.1.0.2 作为私有地址，而 10.1.16.2 仍作为存储地址。

由索引模型根据 Issue 内容生成。