`iptrunk_migration` updates related to BFD

When iptrunk_type == Leased, update is needed to the BFD config on the remaining_side.

geant/gap_ansible/roles/iptrunk_checks/tasks/check_bfd.yaml

+- name: Juniper BFD check
+  when: local_side.iptrunk_side_node.vendor == "juniper"
+  block:
+    - name: Get status of BFD for neighbor "{{ new_node.router.router_lo_ipv4_address }}"
+      junipernetworks.junos.junos_command:
+        commands:
+          - show bfd session address "{{ new_node.router.router_lo_ipv4_address }}"
+      register: response
+
+    - name: Show status of BFD neigbor
+      ansible.builtin.debug:
+        msg: "{{ response.stdout_lines[0] }}"
+
+- name: Nokia BFD check
+  when: local_side.iptrunk_side_node.vendor == "nokia"
+  block:
+    - name: Get status of BFD for neighbor "{{ new_node.router.router_lo_ipv4_address }}"
+      ansible.netcommon.netconf_rpc:
+        rpc: action
+        xmlns: "urn:ietf:params:xml:ns:yang:1"
+        content: |
+            <global-operations xmlns="urn:nokia.com:sros:ns:yang:sr:oper-global">
+              <md-cli-raw-command>
+                <md-cli-input-line>show lag {{ local_side.iptrunk_side_ae_iface | lower }} bfd</md-cli-input-line>
+              </md-cli-raw-command>
+            </global-operations>
+        display: json
+      register: out
+    - name: Show BFD status
+      ansible.builtin.debug:
+        msg: "{{out.output['rpc-reply']['nokiaoper:results']['nokiaoper:md-cli-output-block'].split('\n')}}"