* 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
Print out the data that fails to validate when doing
schema checking on modules
This allows easier interpretation of error messages.
From:
```
ERROR: DOCUMENTATION.notes.2: expected basestring
```
To:
```
ERROR: DOCUMENTATION.notes.2: expected basestring @ data['notes'][2].
Got {"As with C(include) this task can be static or dynamic, If static
it implies that it won't need templating nor loops nor conditionals and
will show included tasks in the --list options. Ansible will try to
autodetect what is needed, but you can set `static": 'yes|no` at task
level to control this.'}
```
This allows validate-modules to run in an environment where
python 3 is the default. This will no longer be necessary once
validate-modules is updated to work with both python 2 and 3.
