Handle common argument in aggregate parameter for vyos module (#28182)

* Handle common agrument in aggregate parameter for vyos module

*  Add supoort to set parameter in aggregate to it's respctive
   top level argument if value not provided in aggregate.
*  Aggregate argument spec validation
*  Documentation for aggregate

* Fix unit test failure

lib/ansible/modules/network/interface/net_lldp_interface.py

@@ -58,6 +58,20 @@ EXAMPLES = """
   net_lldp_interface:
     name: eth1
     state: absent
+
+- name: Create aggregate of LLDP interface configurations
+  net_lldp_interface:
+    aggregate:
+    - name: eth1
+    - name: eth2
+    state: present
+
+- name: Delete aggregate of LLDP interface configurations
+  net_lldp_interface:
+    aggregate:
+    - name: eth1
+    - name: eth2
+    state: absent
 """
 
 RETURN = """