* Created test for get_policy with AWS managed policy.
* Created failing test for get_policy_version with AWS managed policy.
* Updated AWS managed policies.
* Fixed failing tests.
* Fixed trying to compare datetime with string in test case.
* Fixed CreateDate of AWS managed policies overwritten by their version's CreateDate.
* Fixed and improved tests for managed AWS policies.
* Added test for AWS managed policy with v4 default version.
* Fixed not correctly returning dates for AWS managed policies.
`str(datetime.utcnow())` returns a timestamp that's not of the same
format as the AWS SDK uses, in short it's missing the `T` between the
date and the time.
This causes issues for e.g. Terraform and probably other AWS Go SDK
users. There seems to be some differences between endpoints whether they
return milliseconds or not, the AWS API docs were reviewed and the
decision whether to return timestamps with milliseconds or not based on
the example response documented.
As the timstamps are generated for uniqueness rather than being
hardcoded and then directly cast to a UTC (Z) formed timestamp pytz was
removed as timezone correctness is probably not important.
* Removed Tags field from create_subnet response.
* Added DefaultForAz to create_subnet response.
* Added MapPublicIpOnLaunch to create_subnet response.
* Added OwnerId to create_subnet response.
* Added AssignIpv6AddressOnCreation field for create_subnet and describe_subnet and implemented setting it in modify_subnet_attribute.
* Added SubnetArn to create_subnet response.
* Added AvailabilityZoneId to create_subnet and describe_subnet responses, and error for invalid availability zone.
* Added Ipv6CidrBlockAssociationSet to create_subnet response.
* Added missing fields to describe_subnets response.
* Added myself to list of contributors and marked describe_subnet as implemented.
* Fixed linting errors.
* Fixed blank line containing a tab.
* Fixed accidentally deleted ).
* Fixed broken tests.
* Fixed a bug where default network ACL entries could not be deleted.
* Implemented throwing error when a network entry with the same rule number and egress value already exists.
* Fixed syntax errors.
* Added socket.timeout to possibly raised exceptions in wait_for for Python 3.
