* Avoid having module documentation links to itself
A lot of modules use M(own_module) in their documentation causing a link
in the documentation to itself.
* Make note more clear now
* 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
John R Barker
Dag Wieers
Matt Martz
James Cammarata