Collections related fixes for CI (ansible-collections#96)

* Update module deprecations

Switch version to `removed_at_date`

* Don't install amazon.aws from galaxy

We've been using galaxy to install amazon.aws in shippable, but that
doesn't really work if we aren't publising faster. Get that collection
from git so it is most up to date.

* We need to declare python test deps now

* missed a python dep

This commit was initially merged in https://github.com/ansible-collections/community.aws
See: ansible-collections/community.aws@7cd211e

plugins/modules/ec2_vpc_nat_gateway_info.py

@@ -133,7 +133,8 @@ def main():
     module = AnsibleModule(argument_spec=argument_spec,
                            supports_check_mode=True)
     if module._name == 'ec2_vpc_nat_gateway_facts':
-        module.deprecate("The 'ec2_vpc_nat_gateway_facts' module has been renamed to 'ec2_vpc_nat_gateway_info'", version='2.13')
+        module.deprecate("The 'ec2_vpc_nat_gateway_facts' module has been renamed to 'ec2_vpc_nat_gateway_info'",
+                         date='2021-12-01', collection_name='community.aws')
 
     # Validate Requirements
     if not HAS_BOTO3: