[lag_2]:modified files to get lag members from mini graph

[chitra-raghavan]

Issue:

The script for Lag_2 [single_lag_test.yml] takes the interface number from topo_t1-lag.yml vlan info.
The topo_t1-lag.yml file has the vlan listed in contiguous order from 0 to31. For non-contiguous ports, getting port from vlan info yields wrong port details.
Link to issue : #313

Snip from single_lag_test.yml

set_fact:
iface_behind_lag_member_0: "{{ topology['VMs'][peer_device]['vlans'][0] }}"

set_fact:
iface_behind_lag_member_1: "{{ topology['VMs'][peer_device]['vlans'][1] }}"

What I did :
script: ansible/roles/test/tasks/single_lag_test.yml

• Modified the script to get the lag port details from minigraph_port_indices of the port.
• when the peer_device name matches with the minigraph neighbour name, the port indices of the port is extracted and stored in a list.
• The list members ( lag ports) are used in the script lag_lacp_timing_test.yml

[msftclas]

All CLA requirements met.