elasticache: add requirements to parameter_group and snapshot (#24904)

* Add requirements to elasticache parameter group

* add requirements for elasticache_snapshot

* pep8 elasticache_snapshot

* remove elasticache_snapshot from legacy files

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

@@ -28,6 +28,7 @@ description:
   - Returns information about the specified cache cluster.
 version_added: "2.3"
 author: "Sloane Hertel (@s-hertel)"
+requirements: [ boto3, botocore ]
 options:
   group_family:
     description:

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

@@ -28,6 +28,7 @@ description:
   - Returns information about the specified snapshot.
 version_added: "2.3"
 author: "Sloane Hertel (@s-hertel)"
+requirements: [ boto3, botocore ]
 options:
   name:
     description:
@@ -135,6 +136,7 @@ try:
 except ImportError:
     HAS_BOTO3 = False
 
+
 def create(module, connection, replication_id, cluster_id, name):
     """ Create an Elasticache backup. """
     try:
@@ -150,6 +152,7 @@ def create(module, connection, replication_id, cluster_id, name):
             module.fail_json(msg="Unable to create the snapshot.", exception=traceback.format_exc())
     return response, changed
 
+
 def copy(module, connection, name, target, bucket):
     """ Copy an Elasticache backup. """
     try:
@@ -161,6 +164,7 @@ def copy(module, connection, name, target, bucket):
         module.fail_json(msg="Unable to copy the snapshot.", exception=traceback.format_exc())
     return response, changed
 
+
 def delete(module, connection, name):
     """ Delete an Elasticache backup. """
     try:

test/sanity/pep8/legacy-files.txt

@@ -103,7 +103,6 @@ lib/ansible/modules/cloud/amazon/ecs_taskdefinition.py
 lib/ansible/modules/cloud/amazon/efs.py
 lib/ansible/modules/cloud/amazon/efs_facts.py
 lib/ansible/modules/cloud/amazon/elasticache.py
-lib/ansible/modules/cloud/amazon/elasticache_snapshot.py
 lib/ansible/modules/cloud/amazon/elasticache_subnet_group.py
 lib/ansible/modules/cloud/amazon/execute_lambda.py
 lib/ansible/modules/cloud/amazon/iam.py