Adding environment variable support for lambda.py in response to feat… (#20705)

* Adding environment variable support for lambda.py in response to feature idea #20479.

Plus a 1-character bug fix.

* fix yaml syntax

* Fixing option name, adding alias, and fixing a line to allow the user to delete environment variables by setting an empty dict.

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

@@ -96,6 +96,12 @@ options:
       - List of VPC security group IDs to associate with the Lambda function. Required when vpc_subnet_ids is used.
     required: false
     default: None
+  environment_variables:
+    description:
+      - A dictionary of environment variables the Lambda function is given.
+    required: false
+    default: None
+    aliases: [ 'environment' ]
 author:
     - 'Steyn Huizinga (@steynovich)'
 extends_documentation_fragment:
@@ -120,11 +126,18 @@ tasks:
     vpc_security_group_ids:
     - sg-123abcde
     - sg-edcba321
+    environment_variables: '{{ item.env_vars }}'
   with_items:
     - name: HelloWorld
       zip_file: hello-code.zip
+      env_vars:
+        key1: "first"
+        key2: "second"
     - name: ByeBye
       zip_file: bye-code.zip
+      env_vars:
+        key1: "1"
+        key2: "2"
 
 # Basic Lambda function deletion
 tasks:
@@ -221,6 +234,7 @@ def main():
         memory_size=dict(type='int', default=128),
         vpc_subnet_ids=dict(type='list', default=None),
         vpc_security_group_ids=dict(type='list', default=None),
+        environment_variables=dict(type='dict', default=None),
         )
     )
 
@@ -250,6 +264,7 @@ def main():
     memory_size = module.params.get('memory_size')
     vpc_subnet_ids = module.params.get('vpc_subnet_ids')
     vpc_security_group_ids = module.params.get('vpc_security_group_ids')
+    environment_variables = module.params.get('environment_variables')
 
     check_mode = module.check_mode
     changed = False
@@ -306,6 +321,8 @@ def main():
             func_kwargs.update({'Timeout': timeout})
         if memory_size and current_config['MemorySize'] != memory_size:
             func_kwargs.update({'MemorySize': memory_size})
+        if (environment_variables is not None) and (current_config['Environment']['Variables'] != environment_variables):
+            func_kwargs.update({'Environment':{'Variables': environment_variables}})
 
         # Check for unsupported mutation
         if current_config['Runtime'] != runtime:
@@ -338,7 +355,7 @@ def main():
                 func_kwargs.update({'VpcConfig':{'SubnetIds': [], 'SecurityGroupIds': []}})
 
         # Upload new configuration if configuration has changed
-        if len(func_kwargs) > 2:
+        if len(func_kwargs) > 1:
             try:
                 if not check_mode:
                     response = client.update_function_configuration(**func_kwargs)
@@ -421,6 +438,7 @@ def main():
                        'Code': code,
                        'Timeout': timeout,
                        'MemorySize': memory_size,
+                       'Environment':{'Variables': environment_variables}
                        }
 
         # If VPC configuration is given