Fix LLDP neighbors detail retrieval on ASR9K devices

[Kani999]

Problem Description

When attempting to retrieve LLDP neighbor details on Cisco ASR9K devices using the get_lldp_neighbors_detail() method, the operation fails with an XMLCLIError. This occurs because ASR9K devices require a more specific XML path in the RPC call.

Current Behavior

The current implementation uses a generic LLDP query:

<Get><Operational>
<LLDP><NodeTable></NodeTable></LLDP>
</Operational></Get>

This works on most IOS-XR devices but fails on ASR9K models with an XMLCLIError.

Proposed Solution

I've implemented a try/except pattern that:

1. First attempts the generic query
2. If that fails, falls back to a more specific query that includes the exact node path:

<Get><Operational>
<LLDP><NodeTable><Node><Naming><NodeName>
<Rack>0</Rack><Slot>0</Slot><Instance>CPU0</Instance>
</NodeName></Naming></Node></NodeTable></LLDP>
</Operational></Get>

This approach maintains compatibility with all IOS-XR devices while adding support for ASR9K models.