* Update validate-modules
* Validates ANSIBLE_METADATA
* Ensures imports happen after documentation vars
* Some pep8 cleanup
* Clean up some left over unneeded code
* Update modules for new module guidelines and validate-modules checks
* Update imports for ec2_vpc_route_table and ec2_vpc_nat_gateway
* new AWS module for ec2 VPC vgw facts
* fixed documentation as suggested by reviewers
* changed iteritems to items for py 3
* improvements to bring in line with #19787
* corrected documentation
* updated doco and exception path