Cleanup net integration test case for network modules (#34684)

*  Remove platform agnostic net_* test cases.
*  Add minimal platform agnostic test cases to individual
   platform-specific test cases

test/integration/targets/vyos_lldp_interface/tests/cli/net_lldp_interface.yaml

@@ -0,0 +1,26 @@
+---
+- debug: msg="START vyos cli/net_lldp_interface.yaml on connection={{ ansible_connection }}"
+
+# Add minimal testcase to check args are passed correctly to
+# implementation module and module run is successful.
+
+- name: Make sure LLDP is not running - setup
+  vyos_config:
+    lines: delete service lldp
+
+- name: Create LLDP configuration using platform agnostic module
+  net_lldp_interface:
+    name: eth1
+    state: present
+  register: result
+
+- assert:
+    that:
+      - 'result.changed == true'
+      - '"set service lldp interface eth1" in result.commands'
+
+- name: Make sure LLDP is not running - teardown
+  vyos_config:
+    lines: delete service lldp
+
+- debug: msg="END vyos cli/net_lldp_interface.yaml on connection={{ ansible_connection }}"