parametrize allow_reassignment in ec2_eni (#41982)

* parametrize allow_reassignment

* fix documentation

* fix version_added

lib/ansible/modules/cloud/amazon/ec2_eni.py

@@ -97,6 +97,13 @@ options:
       - The number of secondary IP addresses to assign to the network interface. This option is mutually exclusive of secondary_private_ip_addresses
     required: false
     version_added: 2.2
+  allow_reassignment:
+    description:
+      - Indicates whether to allow an IP address that is already assigned to another network interface or instance
+        to be reassigned to the specified network interface.
+    required: false
+    default: 'no'
+    version_added: 2.7
 extends_documentation_fragment:
     - aws
     - ec2
@@ -365,6 +372,7 @@ def modify_eni(connection, vpc_id, module, eni):
     secondary_private_ip_addresses = module.params.get("secondary_private_ip_addresses")
     purge_secondary_private_ip_addresses = module.params.get("purge_secondary_private_ip_addresses")
     secondary_private_ip_address_count = module.params.get("secondary_private_ip_address_count")
+    allow_reassignment = module.params.get("allow_reassignment")
     changed = False
 
     try:
@@ -401,7 +409,7 @@ def modify_eni(connection, vpc_id, module, eni):
                 connection.assign_private_ip_addresses(network_interface_id=eni.id,
                                                        private_ip_addresses=secondary_addresses_to_add,
                                                        secondary_private_ip_address_count=None,
-                                                       allow_reassignment=False, dry_run=False)
+                                                       allow_reassignment=allow_reassignment, dry_run=False)
                 changed = True
         if secondary_private_ip_address_count is not None:
             current_secondary_address_count = len(current_secondary_addresses)
@@ -411,7 +419,7 @@ def modify_eni(connection, vpc_id, module, eni):
                                                        private_ip_addresses=None,
                                                        secondary_private_ip_address_count=(secondary_private_ip_address_count -
                                                                                            current_secondary_address_count),
-                                                       allow_reassignment=False, dry_run=False)
+                                                       allow_reassignment=allow_reassignment, dry_run=False)
                 changed = True
             elif secondary_private_ip_address_count < current_secondary_address_count:
                 # How many of these addresses do we want to remove
@@ -561,6 +569,7 @@ def main():
             secondary_private_ip_addresses=dict(default=None, type='list'),
             purge_secondary_private_ip_addresses=dict(default=False, type='bool'),
             secondary_private_ip_address_count=dict(default=None, type='int'),
+            allow_reassignment=dict(default=False, type='bool'),
             attached=dict(default=None, type='bool')
         )
     )