Support for VPC config settings

[berstr]

Customers environment is an internal app platform (running on AWS) with the policy that all resources need to be placed and run within a VPC. Hence there is the need to deploy the lambda function (manual install) into a VPC.

Currently, the config settings available do not allow to specify VPC settings.

In addition to specify VPC settings, their requirement is also that all outbound communication goes through a PROXY.
So the ability to specify PROXY settings is related and required as well - please let me know if I should create a separate issue for this.