Add nxos_lldp module (#34453)

* Add nxos_lldp module

*  Implemetation for nxos_lldp module
*  Integration test for nxos_lldp module

* Minor change

test/integration/targets/nxos_lldp/tests/cli/sanity.yaml

@@ -0,0 +1,51 @@
+---
+- debug: msg="START TRANSPORT:CLI nxos_lldp sanity test"
+
+- name: Make sure LLDP is not running before tests
+  nxos_config:
+    lines: no feature lldp
+    provider: "{{ connection }}"
+
+- name: Enable LLDP service
+  nxos_lldp:
+    state: present
+    provider: "{{ connection }}"
+  register: result
+
+- assert:
+    that:
+      - 'result.changed == true'
+      - '"feature lldp" in result.commands'
+
+- name: Enable LLDP service again (idempotent)
+  nxos_lldp:
+    state: present
+    provider: "{{ connection }}"
+  register: result
+
+- assert:
+    that:
+      - 'result.changed == false'
+
+- name: Disable LLDP service
+  nxos_lldp:
+    state: absent
+    provider: "{{ connection }}"
+  register: result
+
+- assert:
+    that:
+      - 'result.changed == true'
+      - '"no feature lldp" in result.commands'
+
+- name: Disable LLDP service (idempotent)
+  nxos_lldp:
+    state: absent
+    provider: "{{ connection }}"
+  register: result
+
+- assert:
+    that:
+      - 'result.changed == false'
+
+- debug: msg="END TRANSPORT:CLI nxos_lldp sanity test"